Hi,

The manager of a grocery store wishes to look at the efficiency of his staff.

 He takes a random sample of 44 customers. The average length of time it took

 for a customer out was 164.62 minutes with a standard deviation of 34.79 minutes

Calculate a 90% confidence interval for the true average checkout time in his market?

    ME = 1.645(34.79/6.633) 

  164.62 - ME <  < 164.62 + ME 

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