Question 11.64
weatherdeaths
29. Weather-Related Deaths. The Centers for Disease Control track the numbers of deaths due to weather-related causes. Is there is a difference in the pattern of deaths for young people and older people? The following table shows the number of deaths for three weather-related categories, for young people ages 15–24 and older people ages 75–84. Test, using level of significance , whether cause of death and age group are independent.
| Age group |
Heat- related |
Cold- related |
Floods/ storms/ lightning |
Total |
|---|---|---|---|---|
| 15–24 | 106 | 286 | 97 | 489 |
| 75–84 | 490 | 1010 | 53 | 1553 |
| Total | 596 | 1296 | 150 | 2042 |
11.2.29
: Cause of death and age group are independent. : Cause of death and age group are dependent.
From the Minitab output above, none of these expected frequencies is less than one, and none of the expected frequencies is less than five. Therefore, the conditions for performing the test for independence are met. Reject if the . . . The is less than or equal to . Therefore, we reject . Evidence exists, at level of significance , that the variables Cause of death and age group are dependent.