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An investigator computes a 95% confidence interval for a
Chapter 5, Problem 19E(choose chapter or problem)
An investigator computes a 95% confidence interval for a population mean on the basis of a sample of size 70. If she wishes to compute a 95% confidence interval that is half as wide, how large a sample does she need?
Questions & Answers
QUESTION:
An investigator computes a 95% confidence interval for a population mean on the basis of a sample of size 70. If she wishes to compute a 95% confidence interval that is half as wide, how large a sample does she need?
ANSWER:
Solution:
Step 1 of 3:
An investigator wants to compute a 95% confidence interval for a population mean on the basis of a sample size of 70 . If the investigator wants to find 95 % confidence interval that is half as wide, We have to find the sample size that the investigator is required for this.