8 - Tarleton State University

The U.S. average for state and local taxes for a family of four is $4172. A random sample of 20 families in a northeastern state indicates that they paid an annual amount of $4560 with a standard deviation of $1590. At 0.05, is there sufficient evidence to conclude that they pay more than the national average of $4172? Let’s Do It! Doctor … ................
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