Question

Question 16

1. Relationships are detected on a scatterplot by looking for a tendency for:

   		The data points to cluster on a diagonal line.
   		The data points to cluster on a horizontal line.
   		The data points to cluster on a vertical line.
   		the data points to cluster around the center of the graph.

3 points

Question 17

1. If the high values on one variable tend to match the high values on another variable for the cases in a sample, we say that _________ relationship exists between the variables.

   		no
   		a positive
   		a negative
   		a strong

3 points

Question 18

1. The numerator of the Pearson's r correlation coefficient is a statistic called:

   		correlation
   		Chi Square
   		statistical significance
   		covariance

3 points

Question 19

1. Pearson's r correlation coefficients are presented in most statistical software output as a:

   		correlation matrix.
   		contingency table.
   		Pearson diagram.
   		scatterplot

3 points

Question 20

1. 
   An outlier will have a sigificant effect on the the Pearson's r correlation coefficient _____.

   		every time.
   		if the outlier falls on the dominant diagonal.
   		never.
   		if the outlier falls far from the dominant diagonal.

Answer 1

16) We know that, we look for a relationship between two variables by seeing in a scatterplot whether values cluster around a diagonal line, which can be increasing or decreasing. The answer is:

The data points to cluster on a diagonal line.

17) We know that a positive relationship exists between two variables if one variable increases with another, i.e , one variable has high values for high values of another variable. The answer is:

a positive

18) The numerator of Pearson's correlation coefficient is the covariance between the two variables.

Answer : covariance

19) Pearson's r correlation coefficients are presented in most statistical software output as a correlation matrix.

Answer : correlation matrix

20) An outlier will have a sigificant effect on the the Pearson's r correlation coefficient if :

Answer : if the outlier falls far from the dominant diagonal.