Exam 8: Data Analysis and Statistical Methods: Univariate and Bivariate Analyses

In using a univariate chi-square test of distributions for data that has 5 categories the degrees of freedom that would be used to determine the chi-square test statistic would be

The _______________ is a measure of central tendency appropriate for nominal data.

The chi-square test can be used to test a hypothesized population distribution across nominal categories.

The measures of central tendency include all of the following except

If the relationship between two variables has a linear correlation coefficient (r)= 0.30,what is the coefficient of determination?

If additional independent (X)variables are added into the regression equation,r² will always get larger.To correct for this situation,statisticians have developed the _______________,which is not so easily influenced by additional variables.

Given the null hypothesis H₀ : $\mu$ = 10,what alternative hypothesis would require a two-tailed test?

The most important descriptive statistical procedure appropriate for use with two interval variables is the

For interval data,the chi-square test is the most appropriate inferential statistical test.

The _______________ is a procedure for comparing a hypothesized population distribution across nominal categories against an observed distribution.

If the significance level for a hypothesis test is set at 0.03,the confidence level of the test would be

The usual starting point in hypothesis testing is to specify the level of Type II error the researcher is willing to tolerate.

The linear correlation coefficient is scale-dependent,because the scale of the two variables will impact the correction coefficient.Changing one or both scales will change the coefficient.

For questions #20 through 24 relate back to this situation: A product manager is concerned with whether or not her product's share is equal to 25 percent of the market. A sample of 35 data points yields a sample proportion equal to 38 percent. -What inferential statistical test is appropriate for the hypothesis in question #20?

When the sample size is small (< 25),the t and z distributions are very close to one another.

Based on the following array of data,calculate the mean,median,mode,and the absolute frequency of the value "10." Data: 14,23,10,12,11,5,7,16,10

In hypothesis testing,researchers never "accept" a null hypothesis,merely "fail to reject."

Descriptive statistics are used to make inferences about a population.

Given the problem,hypothesis,and test procedure stated in questions #20 through 23,a calculated test value of 1.78 is obtained.What conclusion is possible,assuming a 95 percent confidence level?

The effect of units is eliminated by dividing the covariance by the standard deviation of the two variables to calculate a measure called the