Decide, in each case, whether the appropriate method for obtaining the confidenc

Question

Decide, in each case, whether the appropriate method for obtaining the confidence interval is the z-interval procedure, the t-interval procedure, or neither. a. A random sample of size 50 is taken from a population. A boxplot of the sample data reveals no outliers. The population standard deviation is known. b. A random sample of size 25 is taken from a population. A normal probability plot of the sample data shows three outliers but is otherwise roughly linear. Checking reveals that the outliers are due to recording errors and are really not outliers. The population standard deviation is known.

Explanation / Answer

(a) Since the population standard deviation is known, the z- interval procedure has to be used

(b) Since the population standard deviation is known and the normal probability plot is linear, the z- interval procedure has to be used

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