What sample size use to estimate true average time

Reference no: EM13144581

A large supermarket chain would like to estimate the amount of time people spend looking at a particular type of in store display. From similar studies they believe the standard deviation of the time would be around 6.2 minutes. If they would like to estimate the true average time to within 1.9 minute (with 95% confidence) what sample size should they use? (remember to round to the next largest integer.)

Reference no: EM13144581

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