An analyst has a set of normally distributed internally scaled data resulting from two observations on the same sample of subjects,and he wishes to investigate if there is any difference in these two means.The appropriate statistical procedure is
A)a z-test for difference in two means.
B)analysis of variance (ANOVA).
C)a paired samples t-test.
D)a chi-square goodness-of-fit test.
E)regression analysis.

Question

Quizplus · Accepted Answer

The appropriate statistical procedure for comparing two means of internally scaled data resulting from two observations on the same sample of subjects is a paired samples t-test. This test is designed to test whether the means of two dependent samples are equal. Option A (z-test for difference in two means) is not appropriate for normally distributed data with small sample sizes, and Option B (ANOVA) is used to compare means of three or more independent groups. Option D (chi-square goodness-of-fit test) and Option E (regression analysis) are not appropriate for comparing two means.

An Analyst Has a Set of Normally Distributed Internally Scaled