Ch 4 Review1 - AP Statistics Chapter 4 Review Problems Date...

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AP Statistics Date _________________________ Chapter 4 Review Problems 4.77 Killing Bacteria: Expose marine bacteria to x-rays for time period from 1 to 15 minutes. Here is the number of surviving bacteria, in hundreds, on a culture plane after each exposure time. Time, x Count, y Time, x Count, y Time, x Count, y 1 355 6 106 11 36 2 211 7 104 12 32 3 197 8 60 13 21 4 166 9 56 14 19 5 142 10 38 15 15 a) Does the data suggest exponential decay? How do you know? b) Enter the data into your calculator and sketch a scatter plot. c) Perform an appropriate logarithmic transformation to achieve linearity. Sketch a scatter plot of your transformed data. d) What is the LSRL equation, r and r 2 for the transformed data. e) Perform an inverse operation to obtain an equation relating x and y. f) Use your equation to predict the number of bacteria after 18 minutes.
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4.81 Women and Marital Status: The following two-way table describes the age and marital status of American women in 2000. The table entries are in thousands of women.
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