Refer to the data of Exercise 23 on percentage returns for the twenty-five largest U.S. common stock
Question:
Refer to the data of Exercise 23 on percentage returns for the twenty-five largest U.S. common stock mutual funds.
(a) Based on the data grouping used in constructing your histogram: (i) Estimate the mean for these percentage returns. (H) Estimate the population standard deviation for these percentage returns. (iii) Estimate the median percentage return. (iv) Estimate the interquartile range for these percentage returns.
(b) Now calculate the mean and standard deviation directly from the twenty-five observa- tions and compare them with your answers in (a).
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