Question

In: Statistics and Probability

According to the 2018 American Community Survey, 80% of the 120 million households in the US...

According to the 2018 American Community Survey, 80% of the 120 million households in the US have broadband Internet subscriptions. Consider drawing a random sample of n = 256 households from all households in the US. Let denote the sample proportion of households that have broadband Internet subscriptions.

a) State the mean, standard deviation, and the approximate shape for the sampling distribution of .

b) Based on your answer in part a, what is the approximate probability that is greater than 0.78 but less than 0.85?

Solutions

Expert Solution

a)

The mean of the sampling distribution of

The standard deviation of the sampling distribution of

Also, the approximate shape for the sampling distribution of is approximately normal i.e.

b)

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