Question: A researcher has constructed an 80% confidence interval of m = 45 ± 8, using a sample of n = 25 scores.

a. What would happen to the width of the interval if the research had used a larger sample size?

b. What would happen the width of the interval if the researcher had used 90% confidence instead of 80%?

c. What would happen to the width of the interval if the sample variance increased?