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Assume that you are trying to estimate the expenditure on books which is normally distributed for...

  1. Assume that you are trying to estimate the expenditure on books which is normally distributed for AUS students for this semester. To get that estimate, you sample 25 students and find that AUS students spend an average of 1000 AED on books in this sample. If the standard deviation of expenditure is 600 AED,

    1. Estimate with 90% confidence the average book expenditure.

    2. How many students you need to get in order to be within 30 AED from the mean, with 95% confidence?

    3. If your friend told you that his class spent an average of 1350 AED on books this semester, would you

      believe him? Explain briefly using probabilities.

Math   Statistics-And-Probability   
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