Question

You measure 45 textbooks' weights, and find they have a mean weight of 73 ounces. Assume the population standard deviation is 11 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places < μ <

Answer 1

We need to construct the 90% confidence interval for the population mean μ. The following information is provided:

Sample Mean =	73
Population Standard Deviation (σ) =	11
Sample Size (N) =	45

The critical value for is .

The corresponding confidence interval is computed as shown below:

Therefore, based on the data provided, the 90% confidence interval for the population mean 70.30<μ<75.70

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