The Table below provides the relationship between breast-cancer incidence rate a
ID: 3222910 • Letter: T
Question
The Table below provides the relationship between breast-cancer incidence rate and menopausal status by age, based on NHS data from 1976 to 1990.
Premenopausal Postmenopausal
Age Cases/person-years Cases/person-years
(incidence rate per 100 (same)
person years)
35-39 124/131,704 (94) 15/14,795 (101)
40-44 264/179,132 (147) 47/43,583 (108)
45-49 304/151,548 (201) 163/90,965 (179)
50-54 159/61,215 (260) 401/184,597 (217)
55-59 25/6133 (408) 490/180,458 (272)
Assess whether there is a difference between the incidence rate of breast cancer for premenopausal vs. postmenopausal women, while controlling for age. Report a p-value.
Explanation / Answer
H0 : There is no difference between the incidence rate of breast cancer ofr premenopausal VS postmenopausal women
H1: There is difference between the incidence rate of breast cancer ofr premenopausal VS postmenopausal women
The expected frequencies are
The chisquare contribution values are
Degrees of freedom: 4
Test Statistic, X^2: 11.4007
Critical X^2: 9.48772
P-Value: 0.0224
Here p-value < alpha 0.05, so we reject H0
Thus we conclude that There is difference between the incidence rate of breast cancer ofr premenopausal VS postmenopausal women
i.e. there is association between premenopausal and postmenopausal women
0 Premenopausal Postmenopausal Total 35-39 108.933 86.067 195 40-44 142.451 112.549 255 45-49 212.28 167.72 380 50-54 266.467 210.53 476.997 55-59 379.869 300.13 679.999 Total 1110 877 1987Related Questions
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