# MAT 118 DEPARTMENTAL FINAL EXAMINATION (written part) REVIEW. Ch 1-3. One problem similar to the problems below will be included in the final

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1 MAT 118 DEPARTMENTAL FINAL EXAMINATION (written part) REVIEW Ch 1-3 One problem similar to the problems below will be included in the final 1.This table presents the price distribution of shoe styles offered by an online outlet. Class limits Frequency For this scenario, identify the following: a) Individual b) Population c) Population size d) Variable e) Shape of the distribution 2. A frequency distribution for the ages of students in a Statway class is given below. x = age f = frequency fx Totals: a) Construct a histogram or a bar graph for the data b) What is the shape of the distribution? c) Fill in the missing values in the table and compute the mean age of the students. d) Find the median age e)which value, mean or median, is a better measure of the center in this case. Explain

2 3. The following frequency table shows the test score distribution for a random sample of 25 students in an introductory statistics class. Score Relative Frequency a. Find the missing relative frequency. b. How many students in the sample had a score of at least 63? c. If there are 800 students total in all of the introductory statistics classes, estimate how many students scored between 52 and 84 in the test. d. Determine the midpoints of the classes and use them to compute the average test score for the sample. 4. The stem and leaf plot below lists the ages (in years) at the time of the award of the Nobel Prize winners in Economics from 2001 to present. ( stem leaf a. Construct a relative frequency table for these data. Use classes of width 7 and take 51 for the lower limit of the first class. b. Obtain the five-number summary (i.e. Minimum, Q 1, Q 2, Q 3, and Maximum) for the data. c. Construct a box-plot using the statistics computed in part b. Ch 4 One problem similar to the problems below will be included in the final 5. A friend says that she only pays attention to sugar amounts in a cereal. But, when she talks about what she eats, she also is concerned by fat. She believes that low levels of sugar in a food indicate that the food also has low amounts of fat. She also believes that when a food has high levels of sugar it also has high amounts of fat.

4 Calories Calories vs. Sugar Sugar (grams) 15.0 Calories Calories vs. Carbohydrates Carbohydrates (grams) 70 Calories Calories vs. Fat Fat (grams) A B C D E F About how many calories would you predict for a burger that has 20 grams of fat? About how many calories would you predict for a hamburger that has 40 grams of carbohydrates? Which prediction is likely to be more accurate? Why do you think this? Which nutrient has the weakest impact on calories? Why do you think this? What does the idea of strength tell you about whether an nutrient is a good predictor of calories? What is the direction of the fat/calories graph? What does the direction of the line tell you about the association between the amount of fat and the calories in fast food hamburgers? 8 Suppose that for a certain baseball season, winning percentage, y, and on base percentage, x, are linearly related by the least squares regression equation. For this baseball season, the lowest on base percentage was and the highest was a) What does the slope mean in the context of this problem? b) Would it be a good idea to use this model to predict the winning percentage of a team whose on base percentage is 0.156? Why or why not? c) Based on this model, what would you expect the winning percentage to be for a team with on base percentage 0.350? Ch problems similar to the problems below will be included in the final 9. The question, "Do you read books for fun every day?" was asked of a random sample of 500 children ages Results are shown in the table.. Boy Girl total a) In this sample, what proportion of children are boys? yes b) What proportion of children read books for fun every day? no c) What proportion of boys read books for fun every day? total d) What proportion of girls read books for fun every day?

6 17. Polio is a very severe illness that can cause paralysis in its victims. Many people who had polio in the early part of the 1900s became paralyzed and were unable to move their legs or other limbs. The most famous polio victim was Franklin D. Roosevelt, who was the US President from In 1954, researchers did a randomized experiment on the effectiveness of a vaccine to prevent Polio. The real vaccine was given to 200,745 children and a fake vaccine was given to 201,229 children. The results showed that 33 of the children given the real vaccine developed polio, while 115 of the children given the fake vaccine developed polio. A Complete the two way table below that compares vaccine type and whether or not the children developed polio. Type of Vaccine Polio Real Fake Totals Developed Polio Did not Develop Polio Totals In sections b d, round your answer to 5 decimal places. B Find the probability that a child was vaccinated and developed polio? Use probability notation and give the answer as a decimal. C Calculate the conditional probability that a vaccinated child developed polio. Use probability notation and give the answer as a decimal. D Calculate the conditional probability that a child given the fake vaccine developed polio. Use probability notation and give the answer as a decimal. E Which children had a greater rate of developing polio? Ch problems similar to the problems below will be included in the final. 18. Suppose that the test results for a certification exam are normally distributed with a mean of 87 and a standard deviation of 17. a. What is the z-score for a test result of 100? b. What value has a z-score of -1.5? c. Approximately what percentage of exam takers will pass if the passing grade is 75?

7 19. The real estate broker's examination in a certain state had a mean score of 435 and a standard deviation of 72. If the board wants to set the passing score so that only the best 35% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. 20. A large survey found that an American family generates an average of 17.2 lb of glass garbage each year. Assume normal distribution with the standard deviation of 2.5 pounds. a) What proportion of families generates less than 16 lbs of glass garbage each year? b) If a family is selected at random, what is the probability that it generated less than 16 lbs of glass garbage in a year? c) If a sample of 55 families is randomly selected, what is the probability that the sample mean is below 16 lb? 21. The amounts of debt people have accumulated one year after having started to use their first credit card is normally distributed. Visa takes a sample of 36 people who opened the account one year ago and finds that for this group of people the average amount of debt accumulated was \$700. The standard deviation is \$180. a) Find the 90% confidence interval for the mean amount of debt Visa can expect credit card holders to accumulate one year after opening their first account b) If you increase the confidence level, will the confidence interval estimate be wider or narrower? Explain. 22. Suppose that we want to test the hypothesis with a significance level of α =.05 that the climate has changed since industrialization. The mean of average annual temperatures throughout recorded history is 50 degrees and the standard deviation is 2 degrees. During the last 40 years, the mean of average annual temperatures has been 51 degrees. What can we conclude? 23. US citizens spend an average of 2.5 hours per day talking and/or texting on cell phones with a standard deviation of 0.7 hours. A sample of 35 teens aged years showed an average of 2.9 hours of cell phone use per day. Can we conclude that teens in this age group spend more time on cell phone then adults at α =.05 level of significance?

8 24. Suppose an editor of a publishing company claims that the mean time to write a textbook is at most 15 months. A sample of 16 textbook authors is randomly selected and it is found that the mean time taken by them to write a textbook was Assume also that the standard deviation is known to be 3.6 months. Assuming the time to write a textbook is normally distributed and using a level of significance, would you conclude the editor s claim is true? 25. The number of hours worked per week by medical residents is normally distributed with a standard deviation of 4.8 hours. We want to test the claim that the mean number of hours worked per week by medical residents is more than 60 hours. Based on a sample of 36 medical residents, what is the largest value of the sample mean for which we would fail to reject the null hypothesis at a 5% significance level? 1. Answer key a) A shoe style b) All shoe styles offered the online outlet c) 443 d) The price e) Skewed right 2. a) Bar graph: c) Mean = 20.6 x = age f = fx frequency Totals: b) Skewed to the right d) Median = 20 (14 th entry) e) The median would be better because the distribution is skewed.

9 3. a) Missing value: = 0.12 b) 25 x 0.76 = 19 c) 800 x 0.56 = 448 d) Sample mean approximately 72.4 Score Relative Midpoint Frequency Sum = a) c) Class Intervals f = frequency rf = Relative Frequency b) Five-number summary Min=51; Q1=58; Q2 (median)=64; Q3=75; Max=90 5 The friend believes that there is a positive correlation between sugar and fat contents. From the scatterplot, it is not evident that there exists any correlation between the two variables. The two variables appear unrelated.

10 6. a) B Each point represents a number of hits and number of home runs for each individual player in the data set C No, you should not, because the scatterplot suggests that there is no association between the number of hits and the number of home runs 7. a) 400 grams b) 600 grams c) A prediction based on the amount of fat is likely to be more accurate, because points on the Calories vs. Fat scatterplot are less dispersed (follow the straight line more closely)than points on the Calories vs Carbohydrates scatterplot. d) Sugar has the weakest impact on calories. Points on Calories vs. Sugar scatterplot are more dispersed (follow the straight line less closely) than points on the other two scatterplots. This indicates the weakest linear association (correlation) between the two variables. e) The stronger is the association (positive or negative) between the nutrient and calories, the more accurate is the prediction of calories based on this nutrient. f) The direction of the fat/calories is positive. It indicates that there is a positive association between the amount of fat and the calories in fast food hamburgers. i.e as the amount of fat increases (decreases) the amount of calories also increases (decreases) 8. d) Every 1% increase in on-base percentage will lead to 2.94% increase in winning percentage. e) Not a good idea, because the x-value of is well outside of the range of values the regression equation was based upon. f) )=

12 15. Let X be the amount won or lost. X (\$) P(X) 1/6 1/6 1/6 1/6 1/6 1/6 E(X) = -1/2 or -\$ a) Event Red Black 2 to 10 picture ace X (\$) P(X) 26/52 18/52 6/52 2/52 E(X) = 5/52 =.0962 of gain of 9.6 cents per game. Type of Vaccine Polio Real Fake Totals Developed Polio Did not Develop Polio Totals b) c) d) e) The children given the fake vaccine had a greater rate of developing polio 18. a) 0.76 b) 61.5 c) about 76% a)p (x<16)= P(z<-.48) =.3156 = 31.6% % of families (or about 1 in 3 families) generate less than 16 lbs of glass garbage each year. b) The probability that a randomly selected family generated less than 16 lbs of glass garbage in a year is P (x<16)=p(z<-.48) =.3156 c) P (ẍ<16) = (z<-3.56) = almost a) (650.65, ) b) The interval will be wider, because the margin of error (E) will be larger. 22. t 0 = 3.16 > t critical =(t 0.025,39 )=2.02. Reject Null hypothesis ( H 0 : μ=50 ). Therefore, there is sufficient evidence to conclude that the climate has changed since industrialization.

13 23. t 0 = 3.38 > t critical = (t 0.05,34 )=1.69. Reject Null hypothesis (H 0 : μ=2.5). Therefore, there is sufficient evidence to conclude at α =.05 level of significance that teens aged years spend more time on cell phone then adults. 24. To conclude that the editor s claim is true, we must be able to reject the Null hypothesis (H 0 : μ=15)in favor of the claim (H a : μ<15), using one-tailed t-test with α =.025 and 15 degrees of freedom T 0 = -2.78< T critical = , so we reject the Null hypothesis. Therefore, there is sufficient evidence to conclude that the editor s claim is true at α = The decision to fail to reject the Null hypothesis (H 0 :μ=60) would be based on the test statistic t o being smaller than t critical = (t 0.05,35 )=1.69 Therefore, the largest value of the sample mean for which we would fail to reject the null is ẍ=μ+ t critical σ / n = (4.8)/ 36= 61.31

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