In a two-sample t-test, there are two approaches: considering the equal variance and considering the unequal variance. What test is used to check if the variance of the two populations is equal or not?a.F testb.t testc.Z testd.Chi-square testClear my choice

The t test for the difference between the means of two independent populationsalways assumes that the respectivea. sample sizes are equalb. sample variances are equalc. populations are normally distributed if each sample size is less than 30d. All of the above

If you were intending to carry out a t-test on your independent sample design, which test might you do instead to compare participants' performance on your two experimental conditions, if the variance is not homogeneous?Question 4Answera.Welch's t-testb.Chi-squarec.Pearson's correlationd.A two-way ANOVA

In order to determine whether or not the means of two populations are equal,Group of answer choiceseither a t test or an analysis of variance can be performedan analysis of variance must be performeda t test must be performedan r test must be performed

Which of the following tests should be used to evaluate the difference between the means of two normally distributed populations?An approximate t-test if the population variances are unknown and assumed unequal and the samples are assumed to be independent.An approximate t-test that involves the calculation of a pooled estimator of the population variances which are assumed unequal.A paired comparison test if the two samples are independent and the population variances are unknown

Which one of the following statements are true about a 2-Sample t-test? It is used to compare differences between two group medians The variances of the two samples are statistically different. The samples to be compared must include the same number of observations Both samples must be from normally distributed processes