# Regents Exam Questions A2.S.7: Exponential Regression

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1 A2.S.7: Exponential Regression: Determine the function for the regression model, using appropriate technology, and use the regression function to interpolate/extrapolate from data 1 A cup of soup is left on a countertop to cool. The table below gives the temperatures, in degrees Fahrenheit, of the soup recorded over a 10-minute period. 3 A colony of bacteria grows exponentially. The table below shows the data collected daily. Write an exponential regression equation for the data, rounding all values to the nearest thousandth. 2 The table below shows the concentration of ozone in Earth s atmosphere at different altitudes. Write the exponential regression equation that models these data, rounding all values to the nearest thousandth. State the exponential regression equation for the data, rounding all values to the nearest hundredth. 4 The table below shows the number of new stores in a coffee shop chain that opened during the years 1986 through Using x = 1 to represent the year 1986 and y to represent the number of new stores, write the exponential regression equation for these data. Round all values to the nearest thousandth. 1

2 5 A population of single-celled organisms was grown in a Petri dish over a period of 16 hours. The number of organisms at a given time is recorded in the table below. 7 A box containing 1,000 coins is shaken, and the coins are emptied onto a table. Only the coins that land heads up are returned to the box, and then the process is repeated. The accompanying table shows the number of trials and the number of coins returned to the box after each trial. Write an exponential regression equation, rounding the calculated values to the nearest ten-thousandth. Use the equation to predict how many coins would be returned to the box after the eighth trial. Determine the exponential regression equation model for these data, rounding all values to the nearest ten-thousandth. Using this equation, predict the number of single-celled organisms, to the nearest whole number, at the end of the 18th hour. 8 Jean invested \$380 in stocks. Over the next 5 years, the value of her investment grew, as shown in the accompanying table. 6 The data collected by a biologist showing the growth of a colony of bacteria at the end of each hour are displayed in the table below. Write the exponential regression equation for this set of data, rounding all values to two decimal places. Using this equation, find the value of her stock, to the nearest dollar, 10 years after her initial purchase. Write an exponential regression equation to model these data. Round all values to the nearest thousandth. Assuming this trend continues, use this equation to estimate, to the nearest ten, the number of bacteria in the colony at the end of 7 hours. 2

3 9 The accompanying table shows the amount of water vapor, y, that will saturate 1 cubic meter of air at different temperatures, x. 11 The table below shows the amount of a decaying radioactive substance that remained for selected years after Write an exponential regression equation for this set of data, rounding all values to the nearest thousandth. Using this equation, determine the amount of the substance that remained in 2002, to the nearest integer. 12 The table below gives the relationship between x and y. Write an exponential regression equation for this set of data, rounding all values to the nearest thousandth. Using this equation, predict the amount of water vapor that will saturate 1 cubic meter of air at a temperature of 50 C, and round your answer to the nearest tenth of a gram. 10 The accompanying table shows the number of bacteria present in a certain culture over a 5-hour period, where x is the time, in hours, and y is the number of bacteria. Use exponential regression to find an equation for y as a function of x, rounding all values to the nearest hundredth. Using this equation, predict the value of x if y is , rounding to the nearest tenth. [Only an algebraic solution can receive full credit.] Write an exponential regression equation for this set of data, rounding all values to four decimal places. Using this equation, determine the number of whole bacteria present when x equals 6.5 hours. 3

4 13 The table below, created in 1996, shows a history of transit fares from 1955 to On the accompanying grid, construct a scatter plot where the independent variable is years. State the exponential regression equation with the coefficient and base rounded to the nearest thousandth. Using this equation, determine the prediction that should have been made for the year 1998, to the nearest cent. 14 The breaking strength, y, in tons, of steel cable with diameter d, in inches, is given in the table below. On the accompanying grid, make a scatter plot of these data. Write the exponential regression equation, expressing the regression coefficients to the nearest tenth. 4

5 15 The accompanying table shows the average salary of baseball players since Using the data in the table, create a scatter plot on the grid and state the exponential regression equation with the coefficient and base rounded to the nearest hundredth. Using your written regression equation, estimate the salary of a baseball player in the year 2005, to the nearest thousand dollars. 5

6 ID: A A2.S.7: Exponential Regression: Determine the function for the regression model, using appropriate technology, and use the regression function to interpolate/extrapolate from data Answer Section 1 ANS: y = (0.954) x REF: a2 2 ANS: y = 0.488(1.116) x REF: a2 3 ANS: y = (1.48) x REF: a2 4 ANS: y = (1.586) x REF: a2 5 ANS: y = (1.1509) x. y = (1.1509) REF: a2 6 ANS: y = (1.652) x (1.652) REF: a2 7 ANS: y = (0.5969) x, 16. REF: b 8 ANS: y = (1.04) x, 562. REF: b 9 ANS: y = 4.194(1.068) x, REF: b 10 ANS: y = (1.0493) x, 1,367. REF: b 1

7 ID: A 11 ANS: y = (0.786) x (0.786) REF: a2 12 ANS: y = 2.19(3.23) x = 2.19(3.23) x REF: a = (3.23) x log = x log(3.23) log log(3.23) x 4.5 = x 2

8 ID: A 13 ANS: y = (0.002)(1.070) x, REF: b 3

9 ID: A 14 ANS: y = 4.8(6.8) x REF: b 15 ANS: y = (1.21) x, \$15,151,000. y = (1.21) 21 \$15,151,000 REF: b 4

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