Question

In: Statistics and Probability

A recent small-scale study surveyed 300 men and women to ask “What automobile is attractive to...

A recent small-scale study surveyed 300 men and women to ask “What automobile is attractive to you?” and asked them to choose from the five options below. Results of the survey are presented in the table. Conduct a test at the alpha=0.01 level to ascertain whether there is a difference in the pattern of responses between men and women consumers. (45 Points)

Auto Brand

Men

Women

Ford F-150

10

40

Mini Cooper

0

60

Geo Metro

60

0

Hyundai Genesis

40

10

Cadillac ATS

40

40

Solutions

Expert Solution

Null hypothesis: Ho: there is no difference in the pattern of responses between men and women consumers.

Alternative hypothesis:Ha: there is a difference in the pattern of responses between men and women consumers.

degree of freedom(df) =(rows-1)*(columns-1)= 4
for 4 df and 0.01 level , critical value       χ2= 13.277
Decision rule : reject Ho if value of test statistic X2>13.277
Applying chi square test of independence:
Expected Ei=row total*column total/grand total Men Women Total
Ford F-150 25.00 25.00 50
Mini Cooper 30.00 30.00 60
Geo Metro 30.00 30.00 60
Hyundai Genesis 25.00 25.00 50
Cadillac 40.00 40.00 80
total 150 150 300
chi square    χ2 =(Oi-Ei)2/Ei Men Women Total
Ford F-150 9.0000 9.0000 18.0000
Mini Cooper 30.0000 30.0000 60.0000
Geo Metro 30.0000 30.0000 60.0000
Hyundai Genesis 9.0000 9.0000 18.0000
Cadillac 0.0000 0.0000 0.0000
total 78.0000 78.0000 156.0000
test statistic X2 = 156.00
since test statistic falls in rejection region we reject null hypothesis
we have sufficient evidence to conclude that there is a difference in the pattern of responses between men and women consumers.

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