Lucy baker is analyzing demographic characteristics

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Mathematics for Elementary School Teachers
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Chapter 7 / Exercise 3
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26. Lucy Baker is analyzing demographic characteristics of two television programs, COPS (population 1) and 60 Minutes (population 2). Previous studies indicate no difference in the ages of the two audiences. (The mean age of each audience is the same.) Lucy plans to test this hypothesis using a random sample of 100 from each audience. Her null hypothesis is ____________. a) μ 1 - μ 2 b) μ 1 - μ 2 > c) μ 1 - μ 2 = 0 d) μ 1 - μ 2 < e) μ 1 - μ 2 < Ans: c 0 0 0 1 Response: See section 10.1 Hypothesis Testing and Confidence Intervals about the
Difference in Two Means using the z Statistic (Population Variances Known) Difficulty: Medium 27. Lucy Baker is analyzing demographic characteristics of two television programs, COPS (population 1) and 60 Minutes (population 2). Previous studies indicate no difference in the ages of the two audiences. (The mean age of each audience is the same.) Lucy plans to test this hypothesis using a random sample of 100 from each audience. Her alternate hypothesis is ____________.
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Mathematics for Elementary School Teachers
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Chapter 7 / Exercise 3
Mathematics for Elementary School Teachers
Bassarear
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0 0 0 Response: See section 10.1 Hypothesis Testing and Confidence Intervals about the
Difference in Two Means using the z Statistic (Population Variances Known) Difficulty: Medium 28. Lucy Baker is analyzing demographic characteristics of two television programs, COPS (population 1) and 60 Minutes (population 2). Previous studies indicate no difference in the ages of the two audiences. (The mean age of each audience is the same.) Her staff randomly selected 100 people from each audience, and reported the following: x 1 = 43 years and x 2 = 45 years. Assume that σ 1 = 5 and σ 2 = 8. two-tail test and α = .05, the critical z values are _________________. With a Response: See section 10.1 Hypothesis Testing and Confidence Intervals about the
Difference in Two Means using the z Statistic (Population Variances Known) Difficulty: Medium 29. Lucy Baker is analyzing demographic characteristics of two television programs, COPS (population 1) and 60 Minutes (population 2). Previous studies indicate no difference in the ages of the two audiences. (The mean age of each audience is the same.) Her staff randomly selected 100 people from each audience, and reported the following: x 1 = 43 years and x 2 = 45 years. Assume that σ 1 = 5 and σ 2 = 8. Assuming a two-tail test and α = .05, the observed z value is _________________.
Response: See section 10.1 Hypothesis Testing and Confidence Intervals about the
Difference in Two Means using the z Statistic (Population Variances Known) Difficulty: Medium

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