Exam 14: Regression Analysis

For questions below, use the following: A random sample of college students was selected from the population of male, physical-education majors. The mean height was 68". The mean weight was 150 lbs. The mean waist-measure size was 32". The standard deviations were, for height, 3" for weight, 30 lbs for waist-size, 2" Significant Pearson r's were, Height and weight, .70 Height and waist-size, .40 Weight and waist-size, .30 -Calculate the standard error of multiple estimate.

For questions below , use the following: A researcher selects a random sample of 8 high school students. Each student is tested on both Need Achievement and Mechanical Aptitude. The scores were: Subject Need Achievement Mechanical Aptitude 1 12 10 2 2 3 3 5 7 4 9 5 5 11 9 6 10 8 7 4 6 8 1 3 -Find the Pearson r correlation between Need Achievement and Mechanical Aptitude.

In regression analysis, when Y increases by two units for each equal single-unit increase in X, then

The value of the standard error of estimate may never be less than

When the Y intercept equals +1.00, then

When the standard error of estimate equals zero, it means that all the data points lie right on the regression line.

In order to use the multiple R,

A negative correlation may never be a significant correlation.

When the correlation between X and Y equals 1.00, the standard error of estimate

The major goal of correlational research is to allow for better-than-chance predictions.

The lower the value of the Pearson r, the greater the likelihood of the Y pred. falling near the mean of Y.

Establishing a three-variable partial correlation, results in

When the correlation between X and Y is zero, then the safest prediction of Y which can be made, give information on X,

In order to produce the regression line, the researcher must know

In regression analysis, the amount of change in Y which accompanies a given unit change in X is designated by

The lower the value of the correlation between X and Y, the more the predicted Y value

When the standard deviation of the Y distribution equals zero, then

The correlation between a criterion variable and two or more predictor variables, is called the

When the standard deviation of both the X and Y distributions are equal, then

Use the following: Assume a significant XY correlation of .60 and a sample size of 62. The mean of X equals 14.00, and the mean of Y equals 2.00. The estimated sd of the sample X equals 3.00 and the estimated sd of Y equals .80. -Find the .95 confidence interval for the predicted Y value. For questions 91 through 94, use the following: Assume a significant XY correlation of .90 and a sample size of 40. The mean of X equals 100.00. The mean of Y equals 500.00. The estimated sd of X equals 10.00. The estimated sd of Y equals 100.00