In developing an interval estimate for a population mean, a sample of 50 observations was used. The interval estimate was 19.76 1.32. Had the sample size been 200 instead of 50, the interval estimate would have been OA. 9.88 OB. 4.94±1.32 1.32 c. 19.76 ± 0.66 OD. 19.76 ± 0.33 The Z value for a 96.6% confidence interval estimate is OA. 1.82 OB. 1.96 OC. 2.00 OD. 2.12

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