The state test scores for 12 randomly selected high school seniors are shown on

Question

The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below. 1230 726 748 1443 980 836 548 944 1422 699 724 620 Assume the population is normally distributed (a) Find the sample mean. x = (Round to one decimal place as needed.) (b) Find the sample standard deviation s-L (Round to one decimal place as needed.) (c) Construct a 90% confidence interval for the population mean A 90% confidence interval for the population mean is (Round to one decimal place as needed.)

Explanation / Answer

The statistical software output for this problem is:

Summary statistics:

90% confidence interval results:

Hence,

a) Mean = 910

b) s = 303.7

c) 90% confidence interval: (752.6, 1067.4)

Column Mean Std. dev. Data 910 303.69333

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