Statistic Quizzes

Question 1

· 
  To be statistically significant, Pearson's r should be greater than 0.90.


Answer

True

False


Question 2

· 
  The relative frequencies in the cells of a 2 × 2 table can be evaluated with a phi coefficient.


Answer

True

False

Question 3

· 
  The scatterplot for a positive relationship will graph from the upper left to the lower right.


Answer

True

False

Question 4

· 
  When scores vary in the same direction on two variables, the relationship is positive.


Answer

True

False

Question 5

· 
  For a Pearson's r, both variables must be linear.


Answer

True

False

Question 6

· 
  To compute a Pearson r correlation coefficient, we must have


Answer

	a.	· · A pair of scores for one individual.
	· b.	· · A single set of scores for a single group of individuals.
	· c.	· · Scores on two different variables for a single set of individuals.
	· d.	· · Scores on two different variables for two different groups of individuals.

Question 7

· 
  In a correlational study, there is/are _______ group(s) of subjects, and each subject is measured on _______ variable(s).


Answer

·	· a.	· 1, 1.
·	· b.	· 1, 2.
·	· c.	· 2, 1.
·	· d.	· 2, 2.

· 


10 points  

Question 8

· 
  The two variables in a correlational study are called the


Answer

·	· a.	· Predictor and predicted.
·	· b.	· Predictor and criterion.
·	· c.	· Independent and dependent.
·	· d.	· Relator and relatist.

Question 9

· 
  In a scatter diagram, if one of the points does not fall on the straight line of best fit to the data points, then r cannot be


Answer

	· a.	0.
·	· b.	+1.00 or -1.00.
·	· c.	Positive.
·	· d.	Negative.

Question 10

· 
  A study reports: r(95) = +0.92, p < 0.01. How confident can you be that the obtained correlation is real and not due to mere chance?



Answer

·	· a.	· 92% confident.
·	· b.	· 95% confident.
·	· c.	· 99% confident.
·	· d.	· There is not enough information to