Exam 22: Bivariate Statistical Analysis: Differences Between Two Variables

____________________ is the appropriate test to use when comparing the means of three or more groups to see if they are significantly different from one another.

The degrees of freedom are calculated asd.f.= n - 1 when using the t-test for comparing two means.

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

A t-test is not appropriate and should not be used when the sample size is greater than 30.

A researcher hypothesizes that males and females differ with respect to attitude toward sports sponsorships.To investigate this hypothesis that these two groups' attitudes differ,he will use a:

Which of the following is the sum of differences between the group mean and the grand mean summed over all groups for a given set of observations?

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

If 25 of the 35 females in a research study agree with a statement,and 15 of the 35 males agree with this statement,the expected value for males-agree is:

The mean of a variable over all observations is called the:

In an ANOVA test of the differences between the means of three groups,the null hypothesis is:

Which test is appropriate for comparing the scores of two interval variables drawn from related populations?

If a researcher is interested in whether adult males purchase a product more frequently than adult females,this is an example of univariate statistics.

What is ANOVA and when is it the appropriate statistical technique? What test is used to determine significance?

When no direction of a relationship is stated in the hypothesis,a one-tailed test is appropriate.

The chi-square test requires that the expected frequency in each cell of the contingency table be at least 30.

If the critical value of chi-square in the chi-square table is 3.84,and the obtained value of chi-square in the study is 3.45,the researcher should:

Suppose that you used a 9-point rating scale and that you wanted to compare men who had an annual income over $50,000 (Group 1)with men who had an annual income less than or equal to $50,000 (Group 2)on their liking of a new product.If you studied 40 men in Group 1 and they have a mean of 7 and a standard deviation of 2.5,while the 35 men in Group 2 have a mean of 5 and a standard deviation of 1.4,what is the approximate value of t using the t-test?

In using the Z-test for comparing two proportions,if the pooled estimate of the proportion of successes is 0.36,then the pooled estimate of proportion of failures is:

The sum of differences between the group mean and the grand mean summed over all groups for a given set of observations is called ____________________.

The F-test partitions the total variance into within-group variance and between-group variance.