If the shopping times for a random sample of 25 shoppers in a supermarket are normally distributed with a known population standard deviation of 15 minutes,the standard error is equal to 0.6.

Question

Quizplus · Accepted Answer

The standard error is calculated as the population standard deviation divided by the square root of the sample size. Given a population standard deviation of 15 minutes and a sample size of 25, the standard error is $15 / \sqrt{25} = 15 / 5 = 3$ minutes, not 0.6.

If the Shopping Times for a Random Sample of 25