INVESTIGATING STATISTICAL CONCEPTS, APPLICATIONS, AND METHODS
BRIEF SOLUTIONS TO INVESTIGATIONS
Investigation 1.1.1: Popcorn Production and Lung Disease
(a) 21/116 = .181
(b) proportion in each group
(c)
|
|
Low exposure |
High exposure |
Total |
|
Airway obstructed |
6 |
15 |
21 |
|
Airway not obstructed |
52 |
43 |
95 |
|
Total |
58 |
58 |
116 |
(e) There appears to be a higher rate of airway obstruction in the “high exposure” group.
(f) Low exposure: 6/58 =.103; High exposure: 15/58 = .259
(g) .259-.103 = .156, seems reasonably large
(h) .650-.494 = .156, same difference but doesn’t “feel” as large?
(i) .259/.103 = 2.51
(j) 21/95 = .22
(k) (15/43)/(6/52) = 3.02