Computing confidence interval for mean

Reference no: EM13105441

The standard deviation of test scores on a certain achievement test is 11.4. A random sample of 100 scores on this test had a mean of 71.2. Based on this sample, find a 90% confidence interval for the true mean of all scores. Complete the below:

What is the lower limit of the 90% confidence interval:___

What is the upper limit of the 90% confidence interval:___

Reference no: EM13105441

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Computing confidence interval for mean : The standard deviation of test scores on a certain achievement test is 11.4. A random sample of 100 scores on this test had a mean of 71.2. Based on this sample, find a 90% confidence interval for the true mean of all scores. Complete the below:

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