Recent evidence has surfaced regarding the effect of multipleCAT scans on the increase in risk for blood related cancers inchildren aged 5-18. Suppose after selecting 267 cases of childhoodcancers, researchers found that 139 had received one or more CATscans. Of the 382 matched sibling controls without blood cancers,only 89 reported having exposure to one or more CAT scan.
A) Calculate the risk difference between the groups fordeveloping blood cancer based on exposure to one or more CAT scansversus never having received a CAT scan.
B) Construct a confidence interval about your point estimate forthe difference in risk.
C) Carry out a formal statistical test to determine if there isa significant difference in risk between the groups.
Choose the most appropriate option
| | option 1   A) risk difference=0.881 B) CI=(0.12, 0.63) C) ) Ho: p1=p2; Ha: p1≠p2 Z stat=9.7 Pvalue: <0.0001 |
| | Option2             A) risk difference=0.288 B) CI=(0.21, 0.36) C) ) Ho: p1=p2; Ha: p1≠p2 Z stat=7.7 Pvalue: <0.0001 |
| | Option 3   A) risk difference=0.128 B) CI=(0.06, 0.16) C) ) Ho: p1=p2; Ha: p1≠p2 Z stat=5.6 Pvalue: <0.01 |
