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Unformatted text preview: 5. [8] A sample 64 shoppers has a mean purchase price of $48 and a standard deviation = $6. Test the null hypothesis than the mean price is greater than or equal to $50. Use a 1% significance level. 6[15] A survey of professors indicates 5 of 20 Econ profs believe in global warming and 18 or 30 English profs believe in global warming. Test the null hypothesis that the proportions of global warming believers are the same for Econ and English professors. Use a .05 significance level. 7. [20] Test the hypothesis that the proportion of frosh=.3, the proportion of sophs=.3, the proportion of juniors=.2 and the proportion of seniors=.______. Fill in the correct value for seniors and use .05 significance level and the following data on enrollments: Group observe Frosh 25 soph 35 junior 25 senior 15...
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 Spring '10
 VANDERHOFF
 Statistics, Mean, Null hypothesis, Statistical hypothesis testing, significance level, Statistical power

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