Chapter 11, Problem 85H

Table 11.42 contains information from a survey among 499 participants classified according to their age groups. The second column shows the percentage of obese people per age class among the study participants. The last column comes from a different study at the national level that shows the corresponding percentages of obese people in the same age classes in the USA. Perform a hypothesis test at the 5% significance level to determine whether the survey participants are a representative sample of the USA obese population.

Age Class (Years)	Obese Expected (Percentage)	Observed Number that recycle one commodity	Obese-Observed (Frequencies)
20−30	22.4	122	17.5
31−40	18.6	104	24
41−50	12.8	78	26.5
51−60	10.4	64	26
61−70	35.8	168	12

Table 11.42