Question

A biomedical researcher doing work in a particular sub-region of the southwestern United States investigated the degree to which 118 individuals who's been randomly selected within that sub-region were afflicted with a particular physical malady. Listed below is the researcher's data. Is disease outbreak dependent on ethnicity? Please use an alpha = .05 and analyze using Chi Square Test of Independence. African American Caucasian Hispanic Disease No Disease 15 Please write the Null and Alternative hypotheses. Ho: Observed frequencies - Expected frequencies... Independence H1: Observed frequencies do not equal Expected frequencies.Dependence Ho: Observed frequencies do not equal Expected frequencies. Dependence H1: Observed frequencies - Expected frequencies..Independence QUESTION 78 1 poir The degrees of freedom (dt) for this analysis is

Answer 1

Ho: Observed frequencies - Expected frequencies...Independence H1: Observed frequencies do not equal Expected frequencies...Dependence

Number of rows =r= 2 Number of columns =C = 3 D.F =(r-1)x(c-1) = 2 Significance level= a = 0.05 Critical Value = 5.991 (Using Excel command CHIINV(a,D.F))

C2 O Observed Values: ci R1 25 R2 15 Column Total 40 25 C3 21 22 43 Row Total 61 57 118 15 20 35 15 20 21 22 0-E)?/E 20.678 0.9034 19.322 0.9668 18.0932 0.5288 16.9068 0.5659 22.2288 0.0679 20.7712 0.0727 Total 3.106 Expected Values = [(Row total x Column total)/Grand total] C1 C2 C3 R1 20.678 18.0932 22.2288 R2 19.322 | 16.9068 20.7712 x==(-5) = 3.106