Exam 14: Correlation and Regression

A linear regression equation is computed for a sample of n = 13 pairs of X and Y scores.For the analysis of regression testing the significance of the equation,what are the df values for the F-ratio?

For a two-tailed hypothesis test evaluating a Pearson correlation,what is stated by the null hypothesis?

If you measured hearing acuity and age for a group of people who are 50 to 90 years old,you should obtain a positive correlation between the two variables.

A set of n = 15 pairs of scores (X and Y values)produces a correlation of r = 0.40.If each of the X values is multiplied by 2 and the correlation is computed for the new scores,what value will be obtained for the new correlation?

A set of X and Y scores has a regression equation with a slope of b = 4.If the mean for the X values is M_X = 2 and the mean for the Y values is M_Y = 6,what is the Y-intercept value for the regression equation?

The results from a research study indicate that adolescents who watch more violent content on television also tend to engage in more violent behavior than their peers.The correlation between amount of TV violent content and amount of violent behavior is an example of _______.

The distance between the Y value in the data and the predicted Y value from the regression equation is know as the residual.What is the value for the sum of the squared residuals?

Under what circumstances is the phi-coefficient used?

If the following seven scores are ranked from smallest (#1)to largest,what rank should be assigned to a score of X = 6? Scores: 1,1,3,6,6,6,9

The phi-coefficient is used to measure relationships for data that would also be appropriate for an independent-measures t test.

For the regression equation Y = X - 2,if the mean for Y is M_Y = 6,what is the mean for X?

What would the scatter plot show for data that produce a Pearson correlation of r = +0.88?

The phi-coefficient is the correct correlation to use when both X and Y are dichotomous variables.

What correlation is obtained when the Pearson correlation is computed for data that have been converted to ranks?

For the regression equation,Ŷ = -2X + 6 what can be determined about the correlation between X and Y?

A researcher records the odometer reading and price for a group of used Hondas.What kind of correlation is likely to be obtained for these two variables?

The regression equation is determined by finding the minimum value for which of the following?

Suppose that there is a correlation of r = 0.41 between the amount of time that each student reports studying for an exam and the student's grade on the exam.This correlation would mean that there is a tendency for people who study more to get better grades.