This means that the distribution of survival times is

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This means that the distribution of survival times is most likely a) left-skewed b) right-skewed c) symmetric d) unimodal e) none of these 16. If a distribution is strongly skewed, then the most appropriate numerical summary of the distribution is a) the two-number summary b) the five-number summary c) the correlation coefficient d) the χ 2 -statistic e) none of these σ x )
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17. The P -value for a hypothesis test is P = 0.375. At which of the following significance levels would we reject the null hypothesis? a) α = 10% b) α = 5% c) α = 1% d) α = 0.1% e) none of these 18. The 92% confidence interval for a population mean μ is (13, 19). In a hypothesis test of H 0 : μ = 17 versus H a : μ 17 at the α = 8% significance level, we would a) accept H 0 b) reject H 0 c) accept H a d) impossible to say e) none of these Use the following scenario for problems 19 through 21 . For a biology project, you measure the weight in grams and the tail length in millimeters (mm) of a group of mice. You then use this data to find the least- squares regression line for predicting tail length from weight: 19. What tail length would you predict for a mouse that weighs 50 grams? a) 20 mm b) 10 mm c) 150 mm d) 170 mm e) none of these 20. How much on average does tail length increase for each additional gram of weight? a) 3 mm b) 20 mm c) 23 mm d) 1/3 mm e) none of these 21. The correlation coefficient between weight and tail length is r = 0.80. What fraction of the variation in tail length is explained by the least squares regression onto weight? a) 0.80 b) 0.64 c) 0.20 d) 0.36 e) none of these Use the following scenario for questions 22 through 24 . Below is a histogram of light bulb lifetimes from a simple random sample of 30 bulbs taken from an assembly line. Note that the vertical axis is given in counts (i.e. number of bulbs). Assume that no data point fell exactly on a class (i.e. bin) boundary. 22. Circle all words below that describe the shape of the distribution of light bulb lifetimes unimodal bimodal uniform symmetric left-skewed right-skewed 23. What percent of light bulbs in the sample lasted less than 1100 hours?
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