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A cell phone company offers two plans to its subscribers. At the time new subscribers sign...

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Statistics

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 $50,500 with a standard deviation of$6,700. For a sample of 25 subscribers to Plan B, the mean incomeis $53,300 with a standard deviation of $6,300.

At the 0.02 significance level, is it reasonable to conclude themean income of those selecting Plan B is larger? Hint: For thecalculations, assume the Plan A as the first sample.

The test statistic is ____. (Negative value should be indicatedby a minus sign. Round your answer to 2 decimal places.)

Answer & Explanation Solved by verified expert
3.8 Ratings (404 Votes)
Test and CI for Two Variances Method Null hypothesis Sigma1 Sigma2 1 Alternative hypothesis Sigma1 Sigma2 not 1 Significance level Alpha 002 Statistics Sample N StDev Variance 1 40    See Answer
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