Assuming the population has an approximate normal distribution, if a sample size n=31 has a sample mean ¯x=37 with a sample standard deviation s=7, find the margin of error at a 80% confidence level. Round the answer to two decimal places.
Added by Karen P.
Step 1
First, we need to find the critical value for an 80% confidence level. We can use a z-table or calculator to find this value. The critical value for an 80% confidence level is 1.28. Show more…
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