In repeated sampling of n = 25 graduates, the interval which contains the middle 95% of sample mean costs is: x = ______, x = ______

1

What fraction of sample means from samples of size n = 16 graduates fall within $4,000 from the population mean?

7

What fraction of sample means from samples of size n = 16 graduates fall within $4,000 from the population mean?

7

What fraction of sample means from samples of size n = 16 graduates fall within $4,000 from the population mean?

7

Hello All,

I've been struggling with the following Stats Homework:

1.

The mean cost of getting a four-year college degree in a certain region of the country is $48,600 with a standard deviation of $8,100.Assume costs are normally distributed.

The fraction of costs for all graduates in this region that fall within $4,000 of the mean cost is?

2.

What fraction of sample means from samples of size n = 16 graduates fall within $4,000 from the population mean?

3.

In repeated sampling of n = 25 graduates, the interval which contains the middle 95% of sample mean costs is: x = ______, x = ______

4.

In another region 5% of the x values from samples of size n = 25 are under $48,000 and 5% are over $57,000.From this sampling distribution information we can conclude that the population mean cost of a four-year college degree is = _______.

5.

In the previous question, the population standard deviation is = ______.

Thank you