Chapter 3 Review Math 1030

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1 Section A.1: Three Ways of Using Percentages Using percentages We can use percentages in three different ways: To express a fraction of something. For example, A total of 10, 000 newspaper employees, 2.6% of the newspaper work force, lost their jobs uses percentage to express a fraction of total newspaper work force. To describe a change in something. For example, Cisco stock rose 5.7% last week, to $18 uses percentage to describe a change in stock price. To compare two objects. For example, High definition television sets have 125% more resolution than conventional TV sets, but cost 400% more uses percentage to compare the resolutions and the costs of televisions. Using Percentages as Fractions Ex.1 If 10% of eighth-graders smoke and there are 50, 000 eighth-graders, how many eighth-graders smoke? 1

2 Using Percentages to Describe Change Absolute change and relative change We can express the change of something in two ways: The absolute change describes the actual increase or decrease from a reference value to a new value: absolute change = new value reference value. The relative change is a fraction that describes the size of the absolute change in comparison to the reference value: absolute change new value reference value relative change = =. reference value reference value The relative change can be converted from a fraction to a percentage by multiplying by 100%. The relative change formula leads to the following important rules: When a quantity doubles in value, its relative change is 1 = = 100%. When a quantity triples in value, its relative change is 2 = 200%. When a quantity quadruples in value, its relative change is 3 = 300%. And so on. Note that the absolute and relative change are positive if the new value is greater than the reference value and the absolute and relative change are negative if the new value is less than the reference value. Ex.2 Suppose the population of a town was 2, 000 in 1980 and 7, 000 in Find the absolute change and the relative change. 2

3 Ex.3 Depreciating a Computer. You bought a computer three years ago for $1000. Today, it is worth only $300. Describe the absolute and relative change in the computer s value. Using Percentages for Comparisons Absolute change and relative difference Percentages are commonly used to compare two numbers. There are two different ways to compare two objects: The absolute change is the actual difference between the compared value and the reference value: absolute difference = compared value reference value. The relative difference describes the size of the absolute difference as a fraction of the reference value: absolute difference compared value reference value relative difference = =. reference value reference value The relative difference formula gives a fraction. We can convert the answer to a percent difference by multiplying it by 100%. The absolute and relative difference are positive if the compared value is greater than the reference value and the absolute and relative change are negative if the compared value is less than the reference value. 3

4 Ex.4 Suppose we want to compare the price of a $70, 000 Ferrari to the price of a $40, 000 Lexus. Describe the absolute and relative difference. 4

5 Section A.2: Of versus More Than Of versus More Than There are two different ways to state a change with percentages: of and more than. In the case of more than we state the relative change. In the case we are using of, we consider the ratio of the new value and the old value. If the compared value is P % more than the reference value, it is (100 + P )% of the reference value. If the compared value is P % less than the reference value, it is (100 P )% of the reference value. Ex.5 Sale! A store is having 50% off sale. How does an item s sale price compare to its original price? 5

6 Section A.3: Percentages of Percentages Percentage Points versus % When you see a change or difference expressed in percentage points, you can assume it is an absolute change or difference. If it is expressed with the % sign or the word percent, it should be a relative change or difference. Ex.6 Suppose your bank increases the interest rate on your savings account from 2% to 5%. What is the absolute change? What is the relative change? 6

7 Section A.4: Solving Percentage Problems Solving Percentage Problems If the compared value is P % more than the reference value, then compared value = (100 + P )% reference value and compared value reference value = (100 + P )%. If the compared value is P % less than the reference value, then and compared value = (100 P )% reference value reference value = compared value (100 P )%. Ex.7 Retail prices are 25% more than whole sale prices. If the whole sale price is $10, how much is the retail price? Ex.8 (1) You purchase a bicycle with a labeled (pre-tax) price of $760. The local sale tax rate is 7.6%. What is your final cost (including tax)? (2) Your receipt shows that you paid $ for your new shoes, tax included. The local sales tax rate is 6.2%. What was the labeled (pre-tax) price of the shoes? 7

8 Ex.9 Consider the statement: In the past four decades the percentage of bicycle in Italy decreased from 55 per cent, to 3 per cent. What was the previous percentage of bicycle in Italy? 8

9 Section A.5: Abuses of Percentages Solving Percentage Problems There are few common abuses of percentages: shifting reference values, less than nothing, average of percentages. Beware of Shifting Reference Values Ex.10 Because of losses by your employer, you agree to accept a temporary 10% pay cut. Your employer promises to give you 10% pay raise after six months. Will the pay raise restore your original salary? 9

10 Less Than Nothing Ex.11 Impossible Sale. A store advertises that it will take 150% off the price of all merchandise. What should happen when you go to the counter to buy a $500 item? Don t Average Percentages Ex.12 Suppose you got 70% of the questions correct on a midterm exam and 90% of the questions correct on the final exam. Can you conclude that you answered 80% of all the questions correctly? 10

11 Section B.1: Writing Large and Small Numbers Large and small numbers Working with large and small numbers is much easier when we write them in a special format called scientific notation. Scientific notation Scientific notation is a format in which a number is expressed as a number between 1 and 10 multiplied by a power of 10. Ex.13 one billion = 10 9 (ten to the ninth power) 6 billion = = = Ex.14 Numbers in Scientific Notation. Rewrite each of the following statement using scientific notation. (1) The U.S. federal debt is about $9, 100, 000, 000, 000. (2) The diameter of a hydrogen nucleus is about meter. Approximations with Scientific Notation Approximations with scientific notation We can use scientific notation to approximate answers without a calculator. Ex.15 Checking Answers with Approximations. You and a friend are doing a rough calculation of how much garbage New York City residents produce every day. You estimate that, on average, each of the 8 million residents produces 1.8 pounds or ton of garbage each day. Thus the total amount of garbage is 8, 000, 000 person ton. Your friend quickly presses the calculator buttons and tells you that the answer is 225 tons. Without using your calculator, determine whether this answer is reasonable. 11

12 Section B.2: Giving Meaning to Numbers Giving meaning to numbers Now that we have a method for writing large and small numbers, we can put numbers in perspective. We will study three techniques to put the number in perspective: through estimation, through comparisons and through scaling. Perspective through Estimation Definition of order of magnitude estimate An order of magnitude estimate specifies only a broad range of values, such as in the ten thousands or in the millions. Ex.16 We might say that the population of the United States is on the order of 300 million, by which we mean it is nearer to 300 million then to, say, 200 million or 400 million. 12

13 Perspective through Comparisons Ex.17 Consider $100 billion, which is more or less the wealth of the world s richest individuals. It s easy to say a number like 100 billion, but how big is it? 13

14 Perspective through Scaling Ways of expressing scales There are three ways of expressing scales: Verbally: A scale can be described in words such as One centimeter represents one kilometer or, more simply, as 1 cm = 1 km. Geographically: A marked miniruler can show the scale visually. As a ratio: We can state the ratio of a scaled size to an actual size. For example, there are 100, 000 in a kilometer. Thus, a scale where 1 centimeter represents 1 kilometer can be described as a scale ratio of 1 to 100, 000. Ex.18 Scale Ratio. A city map states, One inch represents one mile. What is the scale ratio for this map? 14

15 Ex.19 Earth and Sun. The distance from the Earth to the Sun is about 150 million kilometers. The diameter of the Sun is about 1.4 million kilometers and the diameter of the Earth is about 12, 760 kilometers. Put this numbers in perspective by using a scale model of the scalar system with a 1 to a 10 billion scale. 15

16 Section C.1: Significant Digits Significant digits The digits in a number that represents actual measurements and therefore have meaning are called significant digits. Significant digits: Nonzero digits. Zeros that follow a nonzero digit and lie to the right of the decimal point. Zeros between nonzero digits or other significant zeros. Not significant digits: Zeros to the left of the first nonzero digit. Zeros to the right of the last nonzero digit but before the decimal point. Ex pounds has 3 significant digits and implies a measurement to the nearest pound pounds has 5 significant digits and implies a measurement to the nearest hundredth of a pound students has 1 significant digit and implies a measurement to the nearest hundred students students has 3 significant digits and implies exactly 200 students. 16

17 Ex.21 Counting significant digits. State the number of significant digits and the implied meaning of the following numbers: (1) a time of 280 seconds; (2) a length of meter; (3) a population reported as 250, 000; (4) a population reported as Section C.2: Rounding Significant digits The basic process of rounding numbers take two steps: Step 1: Decide which decimal place (for example, tens, ones, tenths or hundredths) is the smallest that should be kept. Step 2: Look at the number in the nearest place to the right (for example, if rounding the tenths, look at hundredths). If the value in the next place is less than 5 round down, if it is 5 or greater than 5, round up. Ex rounded to the nearest thousandth is rounded to the nearest hundredth is rounded to the nearest tenth is rounded to the nearest one is rounded to the nearest ten is rounded to the nearest hundred is

18 Ex.23 Rounding with significant digits. For each of the following operations, give your answer with the specified number of significant digits: (1) 7.7 mm 9.92 mm; give your answer with 2 significant digits; (2) 240, , 106; give your answer with 4 significant digits. Section C.3: Understanding Errors Types of Error: Random and Systematic Types of error: random error and systematic error There are two types of error: Significant digits: Random errors occur because of random and inherently unpredictable events in the measurement process. We can minimize the effect of random errors by making many measurements and averaging them. Systematic errors occur when there is a problem in the measurement system that affect all measurements in the same way, such as making them all too low or too high by the same amount. If we discover a systematic error, we can go back and adjust the affected measurements. 18

19 Ex.24 Suppose you work in a pediatric office and use a digital scale to weigh babies. If you have ever worked with babies, you know that they usually aren t very happy about being put on a scale. Their thrashing and crying tends to shake the scale making the readout jump around. You could equally well record the baby s weight as anything between 14.5 and 15.0 pounds. The shaking of the scale introduces a random error. If you measure the baby s weight ten times, your measurements will probably be too high in some case and to low in other cases. When you average the measurements you are likely to get a value that better represents the true weight. Now, suppose you have weighed babies all day. At the end of the day, you notice that the scale reads 1.2 pounds when there is nothing on it. In that case, every measurement you made was too high by 1.2 pounds. Therefore, we have a systematic error. Now that you know about this systematic error, you can go back and adjust the affected measurements. Ex.25 Errors in global warming data. Scientists studying global warming need to know how the average temperature of the entire Earth, or the global average temperature, has changed with time. Consider two difficulties (among many others) in trying to interpret historical temperature data from the early 20th century: (1) temperatures were measured with simple thermometers and the data were recorded by hand; (2) most temperature measurements were recorded in or near urban areas, which tend to be warmer than surrounding rural areas because heat released by human activity. Discuss whether each of these two difficulties produces random or systematic errors, and consider the implications of these errors. 19

20 Size of Errors: Absolute versus Relative Sizes of error: absolute error and relative error There are two types of error: The absolute error describes how far a measured value lies from the true value: absolute error = measured value true value. The relative error compares the size of the error to the true value: absolute error measured value true value relative error = =. true value true value The absolute and the relative error are positive when the measured value is greater than the true value and negative when the measured value is less than the true value. Note that the above formula gives the relative error as a fraction which can be converted to a percentage. Ex.26 Suppose you go to a store and ask 6 pounds of hamburger. However, because the store s scale is poorly calibrated, you actually get 4 pounds. Suppose you buy a car which the owner s manual says weighs 3132 pounds, but you find that it really weighs 3130 pounds. Compute the absolute and relative error and discuss why you are disappointed in the first case but you don y care too much in the second case. 20

21 Describing Results: Accuracy and Precision Accuracy and precision Once a measurement is reported, we should evaluate it to see whether it is believable in light of any potential errors. In particular, we should consider two key ideas about any reported value: its accuracy and its precision. The term are often use interchangeably in English, but mathematically they are different. Accuracy describes how closely a measurement approximates a true value. An accurate measurement is very close to the true value. Precision describes the amount of detail in a measurement. Ex.27 Accuracy. If a census says that the population of your home town is 72, 453, but the true population is 96, 000, then the census report is not very accurate. In contrast, if a company projects sales of $7.30 billion and true sales turn out to be $7.32 billion, we would say that the projection is quite accurate. Ex.28 Precision. A distance given as kilometers is more precise than a distance given as 2.3 kilometers because the first number gives detail to the nearest kilometer and the second number gives detail only to the nearest 0.1 kilometer. Similarly, an income of $45, has greater precision than an income of $46, 000 because the first income is precise to the nearest penny and the second income is precise only to the nearest thousand dollars. 21

22 Ex.29 Accuracy and Precision in your Weight. Suppose your true weight is pounds. The scale at the doctor s office, which can be read only to the nearest quarter pound, says that you weigh puonds. The scale at the gym, which gives a digital readout to the nearest 0.1 pound says that you weigh Which scale is more precise? Which scale is more accurate? Summary: Dealing with Errors Summary Errors can occur in many ways, but generally can be classified as one of two basic types: random errors and systematic errors. Whatever the source of an error, its size can be described in two different ways: as an absolute error or as a relative error. Once a measurement is reported, we can evaluate it in terms of its accuracy and its precision. 22

23 Section C.3: Combining Measured Numbers Combining measured numbers In scientific or statistical work, researchers conduct careful analyses to determine how to combine numbers properly. We can use two simple rounding rules: Rounding rule for addition and subtraction: Rounding your answer to the same precision as the least precise number in the problem. Rounding rule for multiplication or division: Rounding your answer to the same number of significant digits as the measurement with the fewest significant digits. Note: to avoid errors, you should do the rounding only after completing all the operations, not during intermediate steps. Ex.30 Suppose that you live in a city with a population of 300, 000. One day, your best friend move to your city to share an apartment with you. What is the population of your city now? 23

24 Section D.1: What Is an Index Number? Definition of index number An index number provides a simple way to compare measurements made at different times or in different places. The value at one particular time (or place) must be chosen as the reference value. The index number for any other time (or place) is index number = value reference value 100. Ex.31 Finding an index number. The price of gasoline in 1965 was 31.2 cents. Suppose the current price of gasoline is $3.20 per gallon. Using the 1975 price (= 56.7 cents) as the reference value, find the price index number for gasoline today and in

25 Making Comparisons with Index Numbers Ex.32 (1) Suppose it cost $700 to fill a gas tank in How much would it have cost to fill the same tank in 2005? (price index for 2005 = 407.4, reference value = 1975 price). (2) Suppose it cost $20.00 to fill the gas tank in How much would it have cost to fill the same tank in 1955? (price index for 1995 = 212.5, price index for 1955 = 51.3, reference value = 1975 price). Changing The Reference Value Ex.33 Suppose the current price of gasoline is $3.20 per gallon. Using the 1985 price (= $1.196) as the reference value, find its price index number. Compare this answer to the answer in Example 1, where 1975 was the reference year. 25

26 Section D.2: The Consumer Price Index Inflation and Consumer Price Index We have seen that the price of gas has risen substantially with time. Most other prices and wages have also risen, a phenomenon we call inflation. Thus, changes in the actual price of gasoline are not very meaningful unless we compare them to the overall rate of inflation, which is measured by the Consumer Price Index (CPI). The Consumer Price Index is based on an average of prices for a sample of more than 60, 000 goods, services, and housing costs. It is computed and reported monthly. The Consumer Price Index is just an index and the reference value is an average of prices during the period Ex.34 To find out how much higher typical prices were in 2005 than in 1995, compute the ratio of the CPIs for the two years using the shorthand CPI 2005 to represent the CPI for 2005 and the shorthand CPI 1995 to represent the CPI for 1995: Ex.35 CPI changes. Suppose you needed $30, 000 to maintain a particular standard of living in How much would you have needed in 2005 to maintain the same standard of living? Assume that the average price of your typical purchased has risen at the same rate as the Consumer Price Index (CPI). 26

27 The Rate of Inflation Rate of Inflation The rate of inflation from one year to the next is usually defined as the relative change in the Consumer Price Index. Ex.36 Fing the inflation rate from 1998 to 1999 (CPI 1998 = 163.0, CPI 1999 = 166.6). 27

28 Adjusting Prices for Inflation Adjusting prices for inflation Given a price in dollars per year X ($ X ), the equivalent price in dollars for year Y ($ Y ) is price in $ Y = ( price in $ X ) CP I Y CP I X where X and Y represent the years, such as 1992 and Ex.37 According to computer performance tests, a Macintosh computer that cost $1, 000 in 2005 had computing power equivalent to that of a supercomputer that sold for $30 million in If computer prices had risen with inflation, how much would the computing power of the 1985 supercomputer have cost in 2005? What does this tell us about the cost of computers? 28

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