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2 answers:
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Answer:
The sample size must be 20 so that sample mean will not differ from the population mean by more than 2 units.
Step-by-step explanation:
We are given the following in the question:
Variance = 14
We need to form a 9% confidence interval such that sample mean will not differ from the population mean by more than 2 units.
Thus, margin of error for the confidence interval is 2.
Formula for margin of error:
Putting the values, we get,
Thus, the sample size must be 20 so that sample mean will not differ from the population mean by more than 2 units.