How is the null hypothesis of the independent-samples t-test verbalized?

How is the null hypothesis of the independent-samples t-test verbalized?

a. There is a difference between the means for the two conditions of the independent variable.
b. There is no difference between the means for the two conditions of the independent variable.
c. The difference between the sample means is equal to .
d. The independent variable has an effect on the dependent variable.

Question 2

Which of the following is not one of the assumptions of the t-test for independent samples?

a. The populations of raw scores form at least a roughly normal distribution.
b. There are two independent samples of interval/ratio scores.
c. There is homogeneity of variance.
d. The standard deviation of at least one of the populations is known.

Question 3

What does the homogeneity of variance assumption state?

a. The two sample variances are equal.
b. The population variance is equal to the variance of the sample selected from it.
c. The variance must stay constant for each subject in the experiment.
d. The variance in one population is equal to the variance in the other population.

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How is the null hypothesis of the independent-samples t-test verbalized?

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