What assumption(s) must be met to conduct an independent-samples t-test? A. There is equal variance in scores between the groups. B. The data from the dependent variable must be normally distributed. C. The data from the dependent variable must be interval or ratio. D. All of these

Which of these is not an assumption of the two-sample t-test?Question 3Answera.Independenceb.Homogeneity of variancec.Normalityd.Sphericity

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

For performing the 2 Sample T Test, what is NOT an assumption?

Which of the following statements is true for calculating the t-score for an independent two-sample t-test?A:    We use the sample means, sample sizes, and a pooled standard deviation.B:    We use the sample means, sample sizes, and the population standard deviation.C:    We use the mean difference between the samples, the standard deviation of the samples, and the average sample size.D:    We use the mean difference between the samples, the standard deviation of the differences, and the sample size.

Miriam is using a one-sample t-test on the following group:Subject #15: 6.5 hoursSubject #27: 5 hoursSubject #48: 6 hoursSubject #80: 7.5 hoursSubject #91: 5.5 hoursWhich of the following statements is true?a.)Miriam needs to use a t-test when the standard deviation is known.b.)The value for the degrees of freedom for Miriam's sample population is five.c.)The value for the degrees of freedom for Miriam's sample population is four.d.)The t-distribution that Miriam uses is taller and has thinner tails than a normal distribution.