Find they have a mean weight of 33 ounces

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You measure 39 textbooks' weights, and find they have a mean weight of 33 ounces. Assume the population standard deviation is 3.9 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.

Do not use StatCrunch. Show all formulas used, work and steps. Be sure to define your variables. 

As in the reading, in your calculations:

  • Use z = 1.645 for a 90% confidence interval
  • Use z = 1.96 for a 95% confidence interval
  • Use z = 2.576 for a 99% confidence interval

Give your answer as an inequality rounded to one decimal place. Then interpret your answer in a complete sentence within the context of the problem.

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Reference no: EM132404102

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