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Statistics professors have claimed that the average number of headaches during a semester of statistics is 16. They sampled 22 students and found a sample

Statistics professors have claimed that the average number of headaches during a semester of statistics is 16. They sampled 22 students and found a sample mean of 13. And a sample standard deviation of 8.

Does the data provide sufficient evidence to support the statistics professors claim? Test at 5% level of significance (use critical value method) ..

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