A random sample of 99 students in a Conservatory of Music found that 9 of the 48 women sampled had “perfect pitch” (the ability to identify, without error, the pitch of a musical note), but only 1 of the 51 men sampled had perfect pitch. Conduct Fisher’s exact test of the null hypothesis that having perfect pitch is independent of sex. Use a directional alternative and let ? = 0.05. Do you reject H0? Why or why not?

Suppose you suddenly remembered that the coefficient of variation (CV) is generally regarded as being a better measure of stand-alone risk than the standard deviation when the alternatives being considered have widely differing expected returns. Calculate the missing CVs, and fill in the blanks in the row for CV in the table. Does the CV produce the same risk rankings as the standard deviation?

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