2 3 5 6 7 8 9 10 11 12 me standard deviation of test scores on a certain achievement test is 11.4. A random sample of 60 scores on this test had a mean of 70.7. Based on t mple, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. arry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formul Lower limit: 5 Upper limit: