Auniversity surveyed recent graduates of the english department for their starting salaries. four hundred graduates returned the survey. the average salary was $25,000, with a standard deviation of $2,500. what is the best point estimate of the population mean?

Step-by-step explanation:

Data given

represent the sample mean obtained

represent the sample deviation obtained

represent the true mean (variable of interest)

n=400 represent the sample size selected

Solution to the problem

The best estimator for the true mean is given by the sample mean , and the reason is: If we assume that in tha random sample each observation follows a normal distribution like this:

Then when we find the expected value for the sample mean we have this:

If we use the properties of the expected value we have:

And since the expected value of each observation is the same we have:

So then we have that the best estimator for the population mean is given by:

8121 because

130,000 divided by 16 is 8121

0.6, 3/5, and 6% are the 3 same portion.

but, when they're all changed to a decimal they would equal to 0.6.

hope this , good luck!