the sample mean refund was 910 with standard deviation 1600 At what is your

The sample mean refund was 910 with standard

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30, the sample mean refund was $910 with standard deviation $1600. At 𝜶 = ?, ??, what is your conclusion?
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20 - 22 5 22 - 25 15 25 - 27 35 27 - 29 20 29 - 31 10 31 - 32 10 32 - 35 5 total 100%
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is collected in 2006 to determine whether union efforts to organize have increased union membership. If the sample results show that 52 of the workers belonged to unions, what is the conclusion at 0,05 significance level? examinations scores midpoints Examinations scores number of students ? ? ? ? ?
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5 Case Study Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that at least 70% of investors are currently confident of meeting their investment objectives. A UBS Investor Optimism Survey, conducted over the period January 2 to January 15, found that 67% of investors were confident of meeting their investment objectives (CNBC, January 20, 2006). Assume that UBS Investor Optimism Survey collected information from 300 investors. Formulate the hypothesis that can be used to test the validity of the brokerage firm executive’s claim. At 0,01 should the executive’s claim be rejected?
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