Question: A sample of size 36 from a normally distributed population variable with population standard deviation 20 had a sample mean of 88. Find a 99%

  1. A sample of size 36 from a normally distributed population variable with population standard deviation 20 had a sample mean of 88. Find a 99% confidence interval for the population mean.
  2. A sample of size 90 from a population variable had a sample mean of 4.74 and a sample standard deviation of 0.71. Find a 90% confidence interval for the population mean.

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