Question 1

If a computer program were to calculate the 99% confidence interval of the mean from an infinite number of random samples from a population, what is the percentage of confidence intervals that would contain the true population mean?

a	95%
b	1%
c	99%
d	5%

Question 2

In a study examining whether a sample of scores is different from the original population mean of 3.50, the 95% confidence interval is found to be 95% CI [-2.80, 3.80]. Based on the CI, what would the conclusion be for a hypothesis test with alpha = .05?

a	Reject the null hypothesis; the sample mean is not significantly different from the original population mean.
b	Fail to reject the null hypothesis; the sample mean is significantly different from the original population mean.
c	Reject the null hypothesis; the sample mean is significantly different from the original population mean.
d	Fail to reject the null hypothesis; the sample mean is not significantly different from the original population mean.

Question 3

Suppose the sample mean is 40, the population mean is 30, and the population standard deviation is 5. What is the Cohen's d value and what does it mean?

a	d does not exist; it cannot be greater than 1
b	d = 2; it is a large effect
c	d = 2; it is a small effect
d	d = 2; it is a medium effect