In August 2002, 47% of parents who had children in grades K–12 were satisﬁed with the quality of education the students receive. In September 2010, the Gallup organization conducted a poll of 1013 parents who have children in grades K–12 and asked if they were satisﬁed with the quality of education the students receive. Of the 1013 surveyed, 437 indicated that they were satisﬁed. Construct a 95% conﬁdence interval to assess whether this represents evidence that parents’ attitudes toward the quality of education in the United States has changed since August 2002.
Answer to relevant QuestionsAccording to menstuff.org, 22% of married men have “strayed” at least once during their married lives. (a) Describe how you might go about administering a survey to assess the accuracy of this statement. (b) A survey of ...According to the U.S. Census Bureau, in 2009, 2.1% of Americans worked at home. An economist believes that the percentage of Americans working at home has increased since then. He randomly selects 150 working Americans and ...In the United States, historically, 40% of registered voters are Republican. Suppose you obtain a simple random sample of 320 registered voters and ﬁnd 142 registered Republicans. (a) Consider the hypotheses H0: p = 0.4 ...Suppose we are testing the hypothesis H0: p = 0.65 versus H1: p ≠ 0.65 and we ﬁnd the P-value to be 0.02. Explain what this means. Would you reject the null hypothesis? Why? To test H0: µ = 4.5 versus H1: µ > 4.5, a simple random sample of size n = 13 is obtained from a population that is known to be normally distributed. (a) If x̄ = 4.9 and s = 1.3, compute the test statistic. (b) Draw a ...
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