A health educator wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children are used for the experiment. First, a baseline of the number of times the children brush their teeth over a month's period is established. Next, the children are shown the dental film and again the number of teeth brushings are recorded for a month. The following data are recorded. 
Assume you are evaluating H 0 with the t test. The df for determining t crit equal _________.
Definitions:
Government Budget
A financial statement presenting the government's proposed revenues and spending for a financial year.
Loanable Funds
The money available for borrowing; the market wherein savers supply funds to borrowers, typically through financial intermediaries.
Interest Rates
The rate at which a borrower is charged interest for borrowing money from a lender.
Perpetuity
An annuity in which the periodic payments begin on a fixed date and continue indefinitely.
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