A social researcher claims that the average adult listens to the ...

[Deast7027]

A social researcher claims that the average adult listens to the radio less than 26 hours per week. He collects data on 25 individuals' radio listening habits and finds that the mean number of hours that the 25 people spent listening to the radio was 22.4 hours. If the population standard deviation is known to be eight hours, can we conclude at the 1 significance level that he is right?

Question 2

You are performing the Wilcoxon rank-sum test. The 13th through 15th values in an ordered array of pooled sample data all equal 180 (while the 12th value is less and the 16th value is more). The appropriate ranks for the three 180 values are:
 a. 14, 14, 14 c. 12.5, 13, 14.5
  b. 13, 14, 15 d. 12.5, 13, 15

[kjo;oj]

Answer to Question 1

H0:  = 26 vs. H1:  < 26
Test statistic: z = -2.25
Rejection region: z < -z.01 = -2.33
Conclusion: Don't reject H0 . No, we cannot conclude at  = .01 that the social researcher is right.

Answer to Question 2

A

[Deast7027]

Gracias!

[diana chang]

YES! Correct, THANKS for helping me on my review