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 reseracher had used a larger sample size? assume other factors are held constant.
b. What would happen to the width of the interval if the reseracher had used 90% confidence instead of 80%?
c. What would happen to the width of the interval if the sample variance increases. assume other factors are held constant.