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Section_7.2[1]

# Section_7.2[1] - Homework for Section 7.2 In questions 1 2...

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Homework for Section 7.2 In questions 1, 2 and 3, each table gives the results from two independent random samples from two populations called A and B. Find the standard error of the difference for each one. 1. n f8e5 X s A 100 73 20 B 200 68 18 2. n f8e5 X s A 25 12.3 1.5 B 25 10.9 2.0 3. n f8e5 X s A 12 88 30 B 10 100 25 For questions 4, 5 and 6, a. State the question as a claim about the difference between two population means (in words). b. Write Ha and Ho in symbols. Say what your symbols stand for. 4. Are children who repeat a grade shorter, on the average, than those who do not? A study compared the average height of 86 boys who had repeated a grade to the average height of 1300 boys who had not repeated. 5. Do students perform better, on the average, when the early questions on an exam are easy? Researchers gave two independent groups of students different exams. One exam had easy questions at the beginning and the other had hard questions at the beginning. Both exams ended with five

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Section_7.2[1] - Homework for Section 7.2 In questions 1 2...

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