16.14:Expected
counts are printed below observed counts
Disease
NoDisease Total
LowCal 13
47 60
19.00 41.00
WellFed 25
35 60
19.00 41.00
Total 38
82 120
Chi-Sq = 1.895 +
0.878 +
1.895 + 0.878 =
5.546
df = 1, P-Value = 0.019
H0: Disease and Diet are independent
HA: Disease and Diet are related
Alpha = .05
Chi-Sq = 5.546
P-value = 0.019
There is sufficient evidence to conclude that Diet and Disease are related.
16.16:Expected
counts are printed below observed counts
Chosen NotChosen
Total
Women 9 93 102
29.14 72.86
Men 91 157 248
70.86 177.14
Total 100 250 350
Chi-Sq = 13.922 + 5.569 +
5.726 + 2.290 =
27.508
df = 1, P-Value = 0.000
H0: Chosen and Sex are independent
HA: Chosen and Sex are related
Alpha = .01
Chi-Sq = 27.508
P-value = 0.000
There is sufficient evidence to conclude that Sex and Chosen are related.
16.22:
We combine the Mild and
Moderate columns.
Expected counts are printed
below observed counts
MildModerate Severe
Total
Aspirin 460
49 509
444.33 64.67
NoAspirin 653
113 766
668.67 97.33
Total 1113
162 1275
Chi-Sq = 0.553 +
3.798 +
0.367 + 2.524 =
7.242
df = 1, P-Value = 0.007/2 =
.0035 (division by 2 since test is one tailed)
H0: Aspirin has no effect on severe strokes
HA: Aspirin reduces severe strokes
Alpha = .01
Chi-Sq = 7.242
P-value = 0.0035
There is sufficient evidence to conclude that Aspirin reduces risk of severe strokes.