4.1602 ± 0.00069 O 4.1602 t 0.00091 eBook MBasicStat7 16.?.015 My Notes Ask Your

Question

4.1602 ± 0.00069 O 4.1602 t 0.00091 eBook MBasicStat7 16.?.015 My Notes Ask Your Teache The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth-graders. Scores on the test range from 0 to 500. Suppose that you give the NAEP test to an SRS of 1024 eighth-graders from a large population in which the scores have mean ?-282 and standard deviation ?·12s.The mean x will vary if you take repeated samples The sampling distribution of x is approximately Normal. It has mean ?-282. what is its standard deviation? (Round your answer to three denal paces) eBook My Notes Ask Your 1/1 points 1 Previous Answers MBasicStat? 16. E.016 The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth-grade students. Scores on the test range from 0 to 500. Suppose that you give the NAEP test to an SRS of 900 eighth-graders from large population in which the scores have mean ?-285 and mean x will vary if you take repeated samples. 6. standard deviation ?-125. 1 SRS of 900 eighth-graders has x-288. Based on this sample, what is a 95% confidence interval for Suppose that an 0 285 ± 8.17 O 8.17 : 0.27 18

Explanation / Answer

Here, Std.deviation= 125 , n = 1024

Sampling distribution of std. Deviation=std.dev/sqrt(n)

= 125/sqrt(1024)

= 3.906

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