Exam 15: Testing for Differences Between Groups and for Predictive Relationships

In regression analysis, the symbol X is commonly used for the ____ variable, and the symbol Y is commonly used for the ____ variable.

Discuss when a paired-samples t-test is appropriate and give an example of when it should be used.

The chi-square test tests the significance of the relationship shown in an R X C contingency table in which R stands for row and C stands for column.

If a researcher is interested in whether adult males purchase a product more frequently than adult females, univariate statistics would be used in the analysis of data.

A pooled estimate of the standard error is a poorer estimate of the standard error than one based on the variance from either sample.

The F-test partitions total variance into ____________________ variance and ____________________ variance.

In multiple regression, the dependent variable must be continuous and interval-scaled.

A(n) ____________________ variable has two distinct levels that are coded as 0 and 1.

A study compares the means of two groups in which there are 45 males in Group 1 and 37 females in Group 2. The degrees of freedom for this study when using the t-test for the difference between means is ____.

In a regression equation, the beta coefficients indicate the effect on the dependent variable of a 1-unit increase in any of the independent variables.

When a researcher is attempting to predict sales volume by using building permits, amount of advertising, and the income levels of residents, the researcher is most likely using ____.

The ____________________ is the mean of a variable over all observations.

Discuss the steps in interpreting a multiple regression output.

Multivariate dependence techniques are variants of the ____, which is a way of modeling some process based on how different variables cause fluctuations from the average dependent variable.

The statistical test used to determine whether there is more variability in the scores of one sample than in the scores of another sample is the ____________________.

A Z-test for differences of proportions requires a sample size greater than 100.

How many degrees of freedom are there in a four-cell chi-square test?

In multiple regression, dummy variables are those that have no effect on the dependent variable.

One way to test the significance of the relationship shown in a contingency tables is by means of the chi-square test.

Which type of analysis involves three or more variables?