3 5. 7 8. The standard deviation of test scores on a certain achievement test is 11.5. A random sample of 90 scores on this test had a mean of 72.3. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: II Upper limit:| Submit Assign Continue Conter Acc Reserved Te of the 20211 0

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.