An investigator computes a 95% confidence interval for a

Chapter 5, Problem 19E

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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?

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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.


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