Chapter 11, Problem 21P

Use the following information to answer the next nine exercises: The following data are real. The cumulative number of

AIDS cases reported for Santa Clara County is broken down by ethnicity as in Table 11.29.

Ethnicity	Number of Cases
White	2,229
Hispanic	1,157
Black/African-American	457
Asian, Pacific Islander	232
	Total = 4075

The percentage of each ethnic group in Santa Clara County is as in Table 11.30.

Ethnicity	Percentage of total county population	Number expected (round to two decimal places)
White	42.9%	1748.18
Hispanic	26.7%
Black/African-American	2.6%
Asian, Pacific Islander	27.8%
	Total=100%

Graph the situation. Label and scale the horizontal axis. Mark the mean and test statistic. Shade in the region

corresponding to the p-value.

Figure 11.14

Let a = 0.05

Decision: ________________

Reason for the Decision: ________________

Conclusion (write out in complete sentences): ________________