A random sample is to be selected from a population that has a proportion of successes  p = 0.66.  Determine the mean and standard deviation of the sampling distribution of p̂ for each of the following sample sizes. (Round your standard deviations to four decimal places.) (a) n = 30 mean standard deviation (b) n = 40 mean standard deviation (c) n = 50 mean standard deviation (d) n = 70 mean standard deviation (e)  n = 120 mean standard deviation (f) n = 220 mean standard deviation

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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.