What is the mean and standard error of the sampling


The Wall Street Journal reported that the age at first startup for 55% of entrepreneurs was 29 years of age or less and the age at first startup for 45% of entrepreneurs was 30 years of age or more.

What is the mean and standard error of the sampling distribution?

What would be the interval that captures 90 percent of the sample proportions using this sampling distribution?

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Operation Management: What is the mean and standard error of the sampling
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