1. A marketing manager wants to determine whether the weekly sales of cola are the same when using a normal shelf location and when using an end-aisle display. Two samples of data are collected. The first sample contains the weekly sales of cola from 10 stores selected randomly to use the normal shelf location while the second sample contains the weekly sales of cola from 10 stores selected randomly to use the end-aisle display. Set up the null and alternative hypotheses to test whether there is any evidence of a difference between the sales of using the two displays. Given the conclusion ata= 0.05.(x ¯ represent the sample mean of two displays respectively, S denote the sample standard deviation of two displays respectively).
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