Arandom sample of 15 people were taken from a normally distributed population, and the mean height of the population is going to be estimated with 95% confidence. what is the appropriate critical value that should be used to build the 95 confidence level?

a)

b)

Step-by-step explanation:

We are given the following information in the question:

Sample size = 15

The population is normally distributed and the mean height of the population is going to be estimated with 95% confidence.

We have to find the appropriate critical value that should be used to build the 95 confidence level.

Confidence interval:

If the population standard deviation is given, we use the z-critical value.

If the population standard deviation is not given, we use the t-critical value.

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