A reading readiness test is administered to 8 matched pairs of first graders.One child of each pair had 3 years of day care experience whereas the other child had none.The results of the test are shown in the following table.(Higher scores indicate greater readiness. ) Assume á=.05,nondirectional test. 
The df for this problem is _______.
Definitions:
Annual Cash Flows
The total amount of money being transferred into and out of a business, affecting its liquidity, over a year.
Required Rate
The minimum return that investors expect to earn from an investment, influencing many financial decisions.
Discounted Payback
A capital budgeting method that calculates the time required to recoup the initial investment in present value terms.
Annual Cash Flows
The total amount of money that is transferred into and out of a business, project, or investment within a year.
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