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2 years ago
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A year ago
 Quote from: Amanda387 (3 years ago)A large university reports that the mean salary of parents of an entering class is $91,600. To see how this compares to his university, a president surveys 28 randomly selected families and finds that their average income is$88,500. If the sample standard deviation is \$10,000, can the president conclude that there is a difference? At α = 0.10, is he correct?H;μ=μ0μ0=91600n=28xbar=88500σ=10000test static z0=xbar-μ0/(σ/√n)=-1.64zα=z0.1=1.28since z0>-zαHypothesis is correct
Anonymous
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4 months ago
 Problem 1:A report states that on average Moroccan boys (12-18 years old) get a haircut 5.8 times a year. An independent researcher randomly selected 20 boys (12-18 years old) and obtained these data.3   2   1   3   7   2   9   4   6   68   0   5   6   4   2   1   3   4   1At α = 0.05, can it be concluded that the average is still 5.8 visits per year? (Hint: use the t test for hypothesis testing) Attached file(s)  Thumbnail(s): You must login or register to gain access to these attachments.
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