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The standard deviation of test scores on a certain achievement test is10.8 .A random sample of70 scores on this test had a mean of74.8 .Based

The standard deviation of test scores on a certain achievement test is10.8

.A random sample of70

scores on this test had a mean of74.8

.Based on this sample, find a95

%

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 alist of formulas.)

Lower limit:

Upper limit:

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