Question: The assumptions are the same for using T or Z in constructing a confidence interval for the population mean. Ideally, a random sample is taken

The assumptions are the same for using T or Z in constructing a confidence interval for the population mean.

  • Ideally, a random sample is taken
  • The population of measurements is normally distributed or a sample of at least 30 is taken.

When do we use a t distribution for estimating the population mean with a confidence interval?

Question 6 options:

The confidence interval is less than 90%

The population standard deviation is unknown.

The confidence level is close to 100%

The sample mean is very small.

The sample mean is very large.

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