Question

You measure 39 textbooks' weights and find they have a mean weight of 44 ounces. Assume...

You measure 39 textbooks' weights and find they have a mean weight of 44 ounces. Assume the population standard deviation is 12.7 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.

Give your answers as decimals, to two places

I am 99% confident that the mean weight of textbooks is between and ounces.

You measure 46 textbooks' weights, and find they have a mean weight of 38 ounces. Assume the population standard deviation is 4.8 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.

Give your answers as decimals, to two places

I am 99% confident that the mean weight of textbooks is between  and  ounces

Math   Statistics-And-Probability   
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sample size = n= 39

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