The mentor of a class researched the number of hours spent on study in a week by each student of the class in order to analyze the correlation between the study hours and the marks obtained by each student. The data on the hours spent per week by 25 students are listed below. 13 12 13 17 24 14 19 16 18 20 16 21 18 23 14 15 22 25 16 22 12 19 21 12 15

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A:

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A:

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Q: For a confidence level of 88%, find the critical z value. Critical z =

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A:

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