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

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

b. What would happen to 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? (assume other factors are held constant.)