In developing an interval estimate for a population mean,the interval estimate was 62.84 to 69.46. The populationstandard deviation was assumed to be 6.50, and asample of 100 observations was used. The mean of thesample wasA. 13.24B. 56.34C. 66.15D. 62.96A random sample of 64 observations has a mean of 30.The population variance is assumed to be 9. The 85.3%confidence interval estimate for the population mean (tothe third decimal place) isOA. (29.456, 30.544)OB. (29.383, 30.617)OC. (28.560, 31.440)D. (28.369, 31.631)

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A First Course in Probability (10th Edition)

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In developing an interval estimate for a population mean, the interval estimate was 62.84 to 69.46. The population standard deviation was assumed to be 6.50, and a sample of 100 observations was used. The mean of the sample was A. 13.24 OB. 56.34 C. 66.15 OD. 62.96