A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information. 
The point estimate for the difference between the means of the two populations is
Definitions:
Liability Account
A financial accounting term representing the debts or obligations of a company incurred during business operations.
Asset Account
An account on a company's balance sheet that represents the value of all assets that the company owns.
Unearned Rent
Income received for rent that has not yet been earned because the period covered by the payment has not yet passed.
Rental Income
Income received from renting out property or other assets.
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