The standard deviation of test scores on a certain achievement test is 10.7. A random sample of 50 scores on this test had a mean of 75 Based on this sample, find a 95% confidence interval for the...

The standard deviation of test scores on a certain achievement test is 10.7. A random sample of  50 scores on this test had a mean of 75 Based on this sample, find a 95% confidence interval for the true mean of all scores. Then give its lower limit and upper limit.