In developing an interval estimate for a population mean, the population standard deviation ? was assumed to be 10 . The interval estimate was 50.92 ± 2.14 . Had ? equaled 20, the interval estimate would be

a. 60.92 ± 2.14
b. 50.92 ± 12.14
c. 101.84 ± 4.28
d. 50.92 ± 4.28


D

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