00:01
All right, and your question said, according to some reports, the proportion of american adults who drink coffee daily is 0 .54.
00:08
Given that parameter, if samples of 500 are randomly drawn from a population of american adults, we are trying to find the mean sample proportion.
00:20
It says the mean and standard deviation of the sample proportion.
00:23
Well, it would be the mean of the sample proportion and the standard deviation of the sample in proportion.
00:29
Okay, so the first part of this, the mean of the sample proportion we expect, because our sample size is large enough, we expect that to equal the population proportion.
00:39
So the answer to the first question would be 0 .54.
00:43
We just expect that to be the same.
00:47
Moving on to the standard deviation.
00:49
The standard deviation of the sampling distribution has a formula that we have to complete, and it is the square root of p times 1 minus p...