Author Question: A random sample of 100 observations from a normal population whose standard deviation is 50 produced ... (Read 99 times)

cool · **on:** Jun 24, 2018

A random sample of 100 observations from a normal population whose standard deviation is 50 produced a mean of 75 . Does this statistic provide sufficient evidence at the 5 level of significance to infer that the population mean is not 80?

Question 2

A nonparametric method that is equivalent to the Wilcoxon rank sum test is the:
a. Wilcoxon signed rank sum test. c. Kruskal-Wallis test.
b. Friedman test. d. Mann-Whitney test.

Missbam101 · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

H0: = 80 vs. H1: 80
Rejection region: z > z.025 = 1.96
Test statistic: z = -1.0
Conclusion: Don't reject H0 . Insufficient evidence at the 5 level to say the population mean differs from 80.

Answer to Question 2

D