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(Solved): A simple random sample of 40 items resulted in a sample mean of 20 . The population standard deviat ...



A simple random sample of 40 items resulted in a sample mean of 20 . The population standard deviation is \( \sigma=9 \). Rou
A simple random sample of 40 items resulted in a sample mean of 20 . The population standard deviation is . Round your answers to two decimal places. a. What is the standard error of the mean, ? b. At confidence, what is the margin of error?


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