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July 28, 2014

Homework Help: Statistics...help

Posted by tanya on Thursday, April 3, 2008 at 2:26pm.

An article claimed that the typical supermarket trip takes a mean of 22 minutes. suppose that in an effort to test this claim, you select a sample of 50 shoppers at a local supermarket. the mean shopping time for the sample of 50 shoppers is 25.36 min. with a standard deviation of 7.24 minutes. using a 0.10 level of significance is there evidence that the mean shopping time at the local supermarket is different from the claimed value of 22 minutes?

***if i plug everything into Z= mean-22minutes/ standard deviation over sqrt of n is that the answer? i am soo confuseddd

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