Suppose You Plan to Build a 90% Confidence Interval Estimate

question 123

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

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