Unformatted text preview: and yielded an average of .82 and a standard deviation of .48. 95% CI: .82 + 1.96(.48/sqrt(179)) 99% CI: .82 + 2.58(.48/sqrt(179)) 95% CI: .742 to .898 99% CI: .72 to .92 3. From a large class, a random sample of 4 grades were drawn yielding a mean of 74 and a standard deviation of 11.5. 95% CI: 74 + 3.182(11.5/sqrt(3)) 99% CI: 74 + 5.841(11.5/sqrt(3)) 95% CI: 52.8 to 95.2 99% CI: 33.6 to 112.8 4. A random sample of 40 cars were clocked as they passed by a checkpoint, and he average speed was 67 miles per hour with a standard deviation of 4 miles per hour. 95% CI: 67 + 2.021(4/sqrt(39)) 99% CI: 67 + 2.58(4/sqrt(39)) 95% CI: 65.69 to 68.31 99% CI: 65.3 to 68.7...
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 Fall '10
 wilk
 Statistics, Standard Deviation

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