Question: Refer to Exercise. A Gallup poll the previous August (1999) asked n = 1028 U.S. adults the same question, and 524 responded that they were somewhat or completely dissatisfied.
a. Repeat the test in Exercise and make a conclusion for August 1999.
b. Referring to the data presented in Exercise and in this one, and assuming the samples were taken independently, is there sufficient evidence to conclude that the proportion of U.S. adults who were dissatisfied changed from August 1999 to August 2000? Justify your answer.
Exercise: A Gallup poll taken in August 2000 (Chambers, 2000) asked U.S. adults in a random sample of n = 1019 about their satisfaction with K-12 education. One question was: "Overall, how satisfied are you with the quality of education students receive in grades kindergarten through grade twelve in the U.S. today-would you say: completely satisfied, somewhat satisfied, somewhat dissatisfied or completely dissatisfied?" There were 622 respondents who said that they were somewhat or completely dissatisfied. Is this sufficient evidence to conclude that a majority of U.S. adults were dissatisfied in August 2000? Carry out the test using a = .05, and make sure to state a conclusion.