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Kroger indicates the average salary per hour of their employees is $9 per hour. A sample...

Kroger indicates the average salary per hour of their employees is $9 per hour. A sample of 13 Kroger employees revealed a mean of $11 per hour with a standard deviation of $3 per hour. Costco indicates the average salary per hour of their employees is $10 per hour. A sample of 15 Costco employees revealed a mean of $9.50 per hour with a standard deviation of $2 per hour. At the .05 significance level, can we conclude there is a mean difference between the Kroger employees’ salary per hour and the Costco employees’ salary per hour?

A.State the null hypothesis:

B.State the alternative or research hypothesis:

C.Select the level of significance:

D.Select the test statistic and rationale:

E.Formulate the decision rule:

F. Make a decision and interpret the results:

math   Statistics-And-Probability   
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