Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly collected from five teenagers in each region of the country. The numbers represent the age at which teenagers obtained their drivers licenses. Use a level of significance of 0.10.

Northeast South West Central

16.3 16.9 16.4 16.2

16.1 16.5 16.5 16.6

16.4 16.4 23.0 16.5

16.5 16.2 20.2 16.4

What test are you going to run?

Suppose you are testing H0: p = .63 versus Ha: p 6 .63 . For a random sample of 100 people, x = 55, where x denotes the number in the sample that have the character- istic of interest. Use a .01 level of significance to test this hypothesis.

Suppose IQ scores were obtained for 20 randomly selected sets of couples. The 20 pairs of measurements yield x = 96.64, y = 96.4, r=0.809, P-value = 0.000, and y = 13.57 +0.86x, where x represents the IQ score of the husband. Find the best predicted value of y given that the husband has an IQ of 90? Use a significance level of 0.05. A Click the icon to view the critical values of the Pearson correlation coefficient r. The best predicted value of y is (Round to two decimal places as needed.)

Which of the following can be represented by a discrete random variable?
a.) The number of obtained spots when rolling a six-sided die
b.) The height of college students
c.) The average outside temperature taken every day for two weeks
d.) The finishing time of participants in a cross-country meet