Author Question: Which of the following tests is essentially a comparison of means? a. Mann-Whitney U b. ... (Read 36 times)

mckennatimberlake · **on:** Jul 8, 2018

Which of the following tests is essentially a comparison of means?

a. Mann-Whitney U
b. Chi-square
c. ANOVA
d. t-test

Question 2

What is unique about chi-square analysis?

a. It is almost always statistically significant.
b. It is used for two nominal variables
c. It demands normal distribution, even of dichotomous variables.
d. It is parametric.

softEldritch · **Reply #1 on:** Jul 8, 2018

Answer to Question 1

ANS: D
One of the most common parametric analyses used to test for significant differences between group means of two samples is the t-test. In its calculation, the numerator is the difference scores of the means of the two samples. In addition, the test uses the pooled standard deviation of the two samples as the denominator.

Answer to Question 2

ANS: B
The chi-square () test compares differences in proportions of nominal level variables. Statistical significance may or may not exist. The test does not demand normal distribution, and it is non-parametric.