# 95% Confidence Interval

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Find the 95% confidence interval for the average time spent waiting for a prescription to be filled at Rex's Rx Center if a random sample of 64 customers showed an average waiting time of 12.3 minutes with a standard deviation of 5.0 minutes.

Please show all work and give a detailed explanation of answer. Thank you.

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#### Solution Preview

N=64

M=12.3

SD=5.0

Then standard error = SD/SQRT(N)= 5/SQRT(64)=0.625

For 95% ...

#### Solution Summary

Find the 95% confidence interval for the average time spent waiting for a prescription to be filled at Rex's Rx Center if a random sample of 64 customers showed an average waiting time of 12.3 minutes with a standard deviation of 5.0 minutes.

Please show all work and give a detailed explanation of answer. Thank you.