Question

In Santa Clara County (California), the demographics of the population are:

Caucasian 47.8%, Hispanic 24.1%, African-American 3.6%, Asian 24.2%, Native American 0.3%

Do cases of AIDS follow these demographics? Fill in the Expected Counts.

Ethnicity	Number of cases (observed)	Expected (one decimal place)
Caucasian	2032
Hispanic	897
African-American	372
Asian	168
Native American	20
TOTAL	3489

Find the contribution to X² for the Hispanics (2 decimal places)._____________________

df = __________________

Answer 1

Ethnicity	Number of cases (Observed)	Expected (one decimal place)	(O - E)^2 /E
Caucasian	2032	1667.7	79.559
Hispanic	897	840.8	3.750
African-American	372	125.6	483.352
Asian	168	844.3	541.765
Native American	20	10.5	8.682
TOTAL	3489	3489.0
		χ2 =	1117.109

Contribution of Hispanics to χ2 = 3.75

Df = 4

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