What is the main goal of measuring central tendency?

• To determine how much the scores in a distribution vary from the mean
• To find out the minimum and maximum scores of a distribution
• To determine if a distribution is skewed or not
• To find a single score that is most typical or most representative of the entire group

Karis is trying to determine if the type of therapy participants engage in is effective for anxiety levels. In this example what is the independent variable?

• anxiety levels
• the participants
• type of therapy
• Karis

Jerry is testing the hypothesis that number of words impacts participants' ratings of how funny jokes are. In this example what is the dependent variable?

• Number of words
• The hypothesis
• There is no dependent variable
• Participants' ratings of how funny jokes are

A research report summarizes the results of the hypothesis test by stating, "t=12.41, p

• The null hypothesis was rejected and the probability of a Type I error is less than .05
• The null hypothesis was rejected and the probability of a Type I error is greater than .95
• The null hypothesis was NOT rejected and the probability of a Type I error is less than .05
• The null hypothesis was NOT rejected and the probability of a Type I error is greater than .95

For a particular sample of size n=10, the largest distance (deviation) between a score and the mean is 11 points. The smallest distance (deviation) between a score and the mean is 4 points. Therefore, the standard deviation will be:

• between 4 and 11
• Greater than 11
• Equal to 0
• Less than 4

What is indicated by a negative value for a correlation?

• A much stronger relationship exists than if the correlation were positive
• A much weaker relationship exists than if the correlation were positive
• Increases in variable X tend to be accompanied by increases in variable Y
• Increases in variable X tend to be accompanied by decreases in variable Y