Author Question: Nonparametric statistical tests should be used when the . a. assumptions of parametric tests are ... (Read 167 times)

lidoalex · **on:** Aug 1, 2018

Nonparametric statistical tests should be used when the .

a. assumptions of parametric tests are not met
b. population distribution is normal
c. variances of scores are equal in the populations sampled
d. dependent variable achieves interval measurement

Question 2

A manufacturer makes ball bearings that are supposed to have a mean weight of 30 g.

A retailer suspects that the mean weight is actually less than 30 g. The mean weight for a random sample of 16 ball bearings is 29.5 g with a standard deviation of 4.3 g. At the 0.05 significance level, test the claim that the mean is less than 30 g.

Carliemb17 · **Reply #1 on:** Aug 1, 2018

Answer to Question 1

A

Answer to Question 2

Test statistic: t = -0.47. Critical values: t = -1.753. Fail to reject . There is not sufficient evidence to support the claim that the mean is less than 30 g.