Ethnicity Number of Cases Percentage of total county population Number of cases expected (round to 2 decimal places White 2229 42.9% 1748.18 Hispanic 1157 26.7% 1088.03 ? Black/African-American 457 2.6% 0.106 ? Asian, Pacific islander 232 27.8% 1132.85 ? Total 4075 100% 3969.166 ? The above data are real. The cumulative number of AIDS cases reported for Santa Clara County is broken down by ethnicity as listed above. a. Let a = 0.05      Decision:      Reason for decision:      Conclusion (in complete sentences) b. Does it appear that the pattern of AIDS cases in Santa Clara County corresponds to the distribution of ethnic groups in this county?   Why or why not?

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.