# Statistics: IQ Score (X) and Exam Score (Y)

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Assuming that the regression equation for the relationship between IQ score and psychology exam score is Y' = 9+ 0.274X, what would you expect the psychology exam scores to be for the following individuals given their IQ exam scores?

Individual
Tim
Tom
Tina
Tory

IQ Score (X)
Tim's IQ Score (X) = 118
Tom's IQ Score (X) = 98
Tina's IQ Score (X) = 107
Tory's IQ Score (X) = 103

Psychology Exam Score (Y)
Tim =
Tom =
Tina =
Tory =

• Statistics: IQ Score (X) and Exam Score (Y) - ,

Substitute each score for X in the regression equation and solve for predicted y (Y').

• Statistics: IQ Score (X) and Exam Score (Y) - ,

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• Statistics: IQ Score (X) and Exam Score (Y) - ,

Tim= 41
Tom=36
Tina= 38
Tory =37

Y'=9+0.274(118)
Y'=41.332

• Statistics: IQ Score (X) and Exam Score (Y) - ,

The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5 in the general population the mean # of cavities after a 6 month check up is 1.73 (@-1.12). Is this a 1 or 2 tailed test