Section 28.2

Exercise Set A: 1, 2, 3, 4, 5, 6, 7, 9

Section 28.3

Exercise Set B: 3

And:

The following table gives the number of deaths due to accidental falls in the United States for 1970:

Test the hypothesis that deaths due to accidental falls are spread uniformly throughout the year.

Answer:

The value of the chi-square test statistics is $\chi^2 = 75.4273$. Using a chi-square distribution with 11 degrees of freedom, the p-value is $1.22 \times 10^{-11}$. Hence the data provide very strong evidence against the hypothesis that deaths due to accidental falls occur uniformly throughout the year.