5.3 Knowledge Check: Hypothesis Testing 2

Each of the following correctly describes the χ 2 (chi-squared) distribution except: A). all possible values are greater than 0 B). it is symmetric. C). is actually the sum of independent squared standard normal distributions. D). it is used for tests for the population variance.

B

The difference between hypothesis tests for two means with equal variances and with unequal variances is the: A). test statistic. B). degrees of freedom. C). sample means. D). sample sizes.

B

Which of the following are cases used for testing two means (select all answers that apply)? A). paired data with equal variances B). paired data with unequal variances C). paired data D). unpaired data with equal variances E). unpaired data with unequal variances

C. D and E

T/F: The Excel function used for the two-tailed test for the population variance is CHISQ.DIST.2T(x,df).

False

T/F: When conducting a test for two means with paired data, compute the mean and standard deviations of the two variables and test each variable separately.

False