1.Assume that a sample is used to estimate a population mean . Find the 99% conf

Question

1.Assume that a sample is used to estimate a population mean . Find the 99% confidence interval for a sample of size 1053 with a mean of 55.7 and a standard deviation of 16.6. Enter your answers accurate to four decimal places.

Confidence Interval

= ( , )

2.You measure 50 textbooks' weights, and find they have a mean weight of 64 ounces. Assume the population standard deviation is 3.4 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.

Keep 4 decimal places of accuracy in any calculations you do. Report your answers to four decimal places.

Confidence Interval

= ( , )

Explanation / Answer

1. From statistical software output:

99% confidence interval: (54.3799, 57.0201)

2. From statistical software output,

90% confidence interval: (63.2091, 64.7909)

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