# Confidence Interval

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A music teacher asks six randomly selected students how many hours per week they practice their instrument. the teacher receives the following answers:10,12,8,9,16,5. Find a 90% confidence interval for the average length of time that a student pratices each week.

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A music teacher asks six randomly selected students how many hours per week they practice their instrument. the teacher receives the following answers:10,12,8,9,16,5. Find a 90% confidence interval for the average length of time that a student pratices each week.

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Then we calculate the average length of time, which is the mean of X. i.e. Xm=10

<br>(the calculation can be referred to the attached EXCEL file)

<br>The standard ...

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