If the ethnicities of AIDS victims followed the ethnicities of the total county population, fill in the expected number of cases per ethnic group.

Perform a goodness-of-fit test to determine whether the occurrence of AIDS cases follows the ethnicities of the general population of Santa Clara County.

A teacher predicts that the distribution of grades on the final exam will be and they are recorded in Table 11.21.

The following data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.23.

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Grade Proportion A 0.25 B 0.30 C 0.35 D 0.10 Table 11.21 The actual distribution for a class of 20 is in Table 11.22. Grade Frequency A 7 B 7 C 5 D 1 Table 11.22