A 90% confidence interval for the mean of a population, whose distribution is un

Question

A 90% confidence interval for the mean of a population, whose distribution is unknown, is calculated from a sample of 25 observations and determined to be (12, 24). Which of the following statements is correct?

We are 90% confident that true population mean is contained in the interval (12, 24).

The margin of error for the confidence interval is 4.

Approximately 90% of all observations in the population lies in the interval (12, 24).

It cannot be determined since the sample size is not big enough.

Explanation / Answer

We are 90% confident that true population mean is contained in the interval (12, 24).

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