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Wks 8, Chapter 7 ____________, ____________: _______ Surname (e.g. “Straayer”), Given Name (e.g. “Dave”) Class time Here are percentage scores from Test 2 for the two sections of this class that I teach. Let’s suppose this is a representative sample of all similar statistics classes. 39.1 69.6 76.5 87.8 1. mean score: ___________________ 40.9 70.4 77.4 91.3 40.9 72.2 77.4 91.3 2. standard deviation: _______________ 52.2 72.2 79.1 92.2 3. Standard error (st. dev. divided by 57.4 73 80.9 92.2 sqrt(samples size): ________________ 60 73.9 81.7 92.2 64.3 74.8 84.3 93 The minimum score to get a “B-“ is 79. 65.2 74.8 85.2 93.9 66.1 74.8 87 94.8 67.8 75.7 87.8 96.5 Test the hypothesis that the average student on such tests earns a “B-“ or better. Use 0.05 as α. 97.4 97.4 100 100 105.2 107 108.7 109.6 111.3 113 Null hypothesis (using symbols): _______________________ Alternate hypothesis (also using symbols): ____________________ Test statistic (give the stastic name, like Z or T, and its value): __________________ P-value: _______________________ State your conclusion in words. Your sentence should not contain words like “stastic”, “hypothesis”, “reject” or “not reject”. It should contain the P-value, (in parentheses) so that a reader who knows what it is can see the justification for your conclusion.