In developing an interval estimate for a populationmean, a sample of 50 observations was used. Theinterval estimate was 19.76 ± 1.32. Had the samplesize been 200 instead of 50, the interval estimatewould have beenA. 9.88 ± 1.32В. 19.76 + 0.66С. 4.94 + 1.32D. 19.76 ± 0.33The minimum sample size needed to estimate apopulation mean within 2 units with a 95% confidencewhen the population standard deviation equals 8 isA. 9В. 8С. 61D. 62

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Description: In developing an interval estimate for a populationmean, a sample of 50 observations was used. Theinterval estimate was 19.76 ± 1.32. Had the samplesize been 200 instead of 50, the interval estimatewould have beenA. 9.88 ± 1.32В. 19.76 + 0.66С. 4.94

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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 A. 9.88 ± 1.32 B. 19.76 ± 0.66 C. 4.94 ± 1.32 D. 19.76 + 0.33

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 A. 9.88 ± 1.32 B. 19.76 ± 0.66 C. 4.94 ± 1.32 D. 19.76 + 0.33

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Concept explainers

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Question

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
A. 9.88 ± 1.32
В. 19.76 + 0.66
С. 4.94 + 1.32
D. 19.76 ± 0.33
The minimum sample size needed to estimate a
population mean within 2 units with a 95% confidence
when the population standard deviation equals 8 is
A. 9
В. 8
С. 61
D. 62

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