A professional tennis player has a serve-return rate of p is equal to 0 point 7 1 A random sample of 55 serve returns is selected. Which of the following is the mean of the sampling distribution of hat p ?

The mean of the sampling distribution of the sample proportion, p-hat, is the population proportion p. Here, p = 0.71, so the mean is 0.71. The sample size affects the variability of p-hat, but not its mean; therefore the correct choice is “mu sub hat p is equal to p is equal to 0.71.”

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