A cell phone company offers two plans to its subscribers. At the
time new subscribers sign...
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A cell phone company offers two plans to its subscribers. At thetime new subscribers sign up, they are asked to provide somedemographic information. The mean yearly income for a sample of 40subscribers to Plan A is $47,200 with a standard deviation of$9,200. For a sample of 30 subscribers to Plan B, the mean incomeis $51,500 with a standard deviation of $7,100. The populationvariances are not equal.
At the .01 significance level, is it reasonable to conclude themean income of those selecting Plan B is larger? Hint: Forthe calculations, assume the Plan A as the first sample.
The test statistic is . (Negative amount should beindicated by a minus sign. Round your answer to 2 decimalplaces.)
The decision is (Click to select)do not rejectreject the nullhypothesis that the mean of Plan B is larger.
The p-value is (Click to select)between 0.025 and0.01between 0.01 and 0.05between 0.05 and 0.1 (Round youranswer to 2 decimal places.)
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4.1 Ratings (661 Votes)
n1 40 47200 s1 9200n230 51500 s27100Here
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