Change the sample size to n80 construct a 90 confidence

Reference no: EM13611003

In a random sample of 40 refrigerators, the mean repair cost was $131.00 and the standard deviation was $19.70. A 90% confidence interval for the population mean repair cost is (125.88,136.12). Change the sample size to n=80. Construct a 90% confidence interval for the population mean repai cost. Which confidence interval is wider. Explain

Reference no: EM13611003

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