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Sports and Leisure
A recent study suggests that, for NASCAR racers, yearly winnings are related to average finish.15 A random sample of NASCAR racers was obtained, and the average finish (x) and total winnings (y, in millions of dollars) through 31 races in 2013 were recorded for each.16
a. Construct a scatter plot of the data. Describe the relationship between average finish and winnings.
b. Find the sample correlation coefficient. Is the value of r consistent with your interpretation in part (a)? Why or why not?
c. Find the estimated regression line, and complete the ANOVA table.
d. Using your results from part (c), what would the average finish have to be in order to win at least $6 million through 31 races?
Recognize and explain potential threats (up to 3) to external validity.
The mean height of women in a country (age 20-29) is 64.3 inches. A random sample of 75 women in this age group is selected. what is the probablity that the mean height for the sample is greater than 65 inches?
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1. in a hospitals shipment of 3500 insulin syringes 14 were unusable due to defects. is this sufficient evidence to
And, if so, how much farther? Players on your local high school baseball team have agreed to help you find out. Design an appropriate experiment.
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