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

[A] What would happen to the width of the interval if the researcher had used 90 percent confidence instead of 80 percent.

[B] What would happen to the width of the interval if the sample variance increased? [Suppose other factors are held constant]

[C] What would happen to the width of the interval if the researcher had used a large sample size? [Suppose other factors are held constant]