1. The degrees of freedom for an independent-measures t-test are df = 18. If the two samples are the same size, what is the sample size of the two samples?

Group of answer choices

n = 10

n = 18

n = 6

n = 9

2. Suppose that the sample mean is M = 60, the population mean is = 50, and the estimated standard error is s_M = 5. What is the result of the single-sample t-test?

Group of answer choices

-2.00

+2.00

None of the other answers are correct.

+1.50

3. Suppose that the sample mean is M = 90, the population mean is = 120, and the estimated standard error is s_M = 20. What is the result of the single-sample t-test?

Group of answer choices

+2.00

+1.50

-2.50

-1.50

4. Suppose that the sample mean of one sample is M₁ = 80, the sample mean of the other sample is M₁ = 65, and the estimated standard error is 7. What is the result of the Independent-Measures t-test?

Group of answer choices

-2.14

+2.15

-2.15

+2.14