Question

suppose you believe that in general, graduates who have majored in your subject are offered higher salaries upon graduating than are graduates of other programs. describe a statistical experiment that could help test your belief.
my problem with this question is what data to use as an example. should i use the graduates as my population or maybe a type of job?

Answer 1

If you can get it, compare $ offers for graduates in your major to all other graduates or all graduates.

Ho: mean$ your major = mean$ other/all majors
Ha: mean$ your major > mean$ other/all majors

After gathering your data,

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

Since only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

Remember that you are using a one-tailed test.