Exam 3: Correlation and Regression

Suppose you had a series of eight measures of anxiety that you administered to a sample. You would use the statistical technique referred to as ____ in order to test the hypothesis that they are all measuring the same thing (anxiety).

What describes how much change is expected in Y each time X increases by one unit?

An appropriate statistical technique that one might use to see how Scholastic Aptitude Test (SAT)scores and high school grades jointly relate to college freshman grades is

To see the correlation between two true dichotomous variables, you should compute

Principal components are found in

The principle of least squares minimizes the squared deviation

It is frequently argued that the Scholastic Aptitude Test (SAT)should not be used to select students because the correlation between their SAT scores and their freshman grades may be low, indicating that the SAT is not a valid measure. How does the concept of range restriction apply here? What other factors might operate to reduce this correlation?

How many variables are required to calculate a correlation coefficient?

Identify and discuss the use of two measures of correlation other than the Pearson r .

An advantage to the use of Z scores in correlation is that it

In a negative correlation,

The correlation coefficient can take any value from

The type of correlation coefficient computed when the data are from a true dichotomous variable and a continuous variable is

The difference between the predicted value of Y and the observed value is called the

A study demonstrates that the number of cigarettes smoked per day is significantly correlated with the number of respiratory infections experienced by young adults. We can conclude that

If the regression between X and Y is less than perfect,

What is the sum of the predicted value of Y and its residual?

A correlation of .80 suggests that

The correlation equals +1 for which of the following four pairs of numbers?

A scatter diagram is a