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For the last several years, the mean number of days kids stay home sick from a...

For the last several years, the mean number of days kids stay home sick from a particular elementary school is 12 days and is normally distributed. The principal believes students actually miss fewer than 12 days. He decides to survey a random sample of students at the end of the school year. Here is the list of the number of days the sample of students missed 6, 8, 14, 12, 10, 13, 13, 10, 11, 9, 12, 14. you want to determine if the principal is justified in his thinking so you conduct a hypothesis test. You decide to let alpha be 0.01.

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