Suppose You Plan to Build a 90% Confidence Interval Estimate

Multiple Choice

Suppose you plan to build a 90% confidence interval estimate of a population mean, using a sample of size 3.You will be estimating the population standard deviation with the sample standard deviation.Assuming the population distribution is approximately normal, the appropriate t value for your interval would be _____ .If you had used a z score instead of the t value here, the z score for the 90% interval would be much too small.In fact the z score for a 90% interval is only ______ .

A) 4.303, 1.65
B) 6.965, 1.96
C) 2.920, 1.65
D) 1.886, 1.65
E) 2.353, 1.96