Statistics: IQ Score (X) and Exam Score (Y)
posted by Joy Chapman .
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?
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)
Substitute each score for X in the regression equation and solve for predicted y (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