here is a difference
in incomes between these two education levels. You may chose your level of significance and you levels of education
you want to test. Please provide an explanation for why you chose these two levels, and the alpha level.
d that 70% of adults go to the doctor for their yearly checkup. If you want to test the validity of this claim, how many adults must be surveyed in order to be 90% confident that the sample percentage is in error by no more than 5 percentage points?