# The Difference between Two Means

## Questions

**Question 1 out of 9.**

The graphs show a violation of the assumption of (check all that apply)

- normality
- homogeneity of variance

**Question 2 out of 9.**

The graphs show a violation of the assumption of (check all that apply)

- normality
- homogeneity of variance

**Question 3 out of 9.**

The graphs show a violation of the assumption of (check all that apply)

- normality
- homogeneity of variance

**Question 4 out of 9.**

In the formula for , the "statistic" is

- the null hypothesis.
- the mean of all numbers.
- the difference between sample means.
- the significance level.

**Question 5 out of 9.**

In the formula for , the "hypothesized value" is

**Question 6 out of 9.**

If the null hypothesis is that two population means are equal, then the hypothesized value is

- 0.
- the population mean.

**Question 7 out of 9.**

The denominator in the test formula is

- the estimated standard error of the mean.
- the estimated standard error of the difference between means.
- MSE/2

**Question 8 out of 9.**

If there are 4 scores per group and the value is 2.34, what is the value for a two-tailed test (to 3 decimal places)?

___________

**Question 9 out of 9.**

What is the t for an independent-groups test for these data?

___________

G 1 G 2 46 28 59 37 53 40 35 34 43 29 28 46 59 26 51 41