An analyst has a set of normally distributed intervally 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)z-test for difference in two means.
B)analysis of variance.
C)paired samples t-test.
D)chi-square goodness-of-fit test.
E)regression analysis.

Question

Quizplus · Accepted Answer

Since the data comes from two observations on the same sample of subjects, the appropriate statistical procedure is the paired samples t-test. This test is used to compare the means of two dependent samples that are normally distributed. The z-test for difference in two means assumes that the population variances are known, and the analysis of variance (ANOVA) is used to compare the means of multiple independent samples. The chi-square goodness-of-fit test is used to test whether a set of categorical data follows a hypothesized distribution, and regression analysis is used to model the relationship between a dependent variable and one or more independent variables.

An Analyst Has a Set of Normally Distributed Intervally Scaled