Comparing a census of a large population to a sample drawn from it, we expect that the A. Sample is usually a more practical method of obtaining the desired information. B. Accuracy of the observations in the census is surely higher than the sample. C. Sample must be a large fraction of the population to be accurate.

Q: 1 The sample mean is _______. a 12.32     b 13.25     c 14.25     d 15.32

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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.