Question

1. A hypothesis test using a Pearson’s correlation coefficient is an example of what?

   		A nonparametric statistic
   		A descriptive statistic
   		An inferential statistic
   		A power statistic

1 points   

QUESTION 48

1. What would the scatter plot show for data that produce a Pearson correlation of r = +0.88?

   		Points clustered close to a line that slopes down to the right
   		Points clustered close to a line that slopes up to the right
   		Points widely scattered around a line that slopes up to the right
   		Points widely scattered around a line that slopes down to the right

1 points   

QUESTION 49

1. Which of the following Pearson correlations shows the greatest strength or consistency of relationship?

   		-.33
   		-.90
   		+.85
   		+.74

1 points   

QUESTION 50

1. A researcher measures daily driving distance from college and weekly cost of gas for a group of commuting college students. What kind of correlation is likely to be obtained for these two variables?

   		A correlation near two
   		A positive correlation
   		A correlation near zero
   		A negative correlation

1 points   

QUESTION 51

1. A set of n = 15 pairs of scores (X and Y values) has SS_X = 4, SS_Y = 25, and SP = 6. What is the Pearson correlation for these data?

   		.60
   		.06
   		.03
   		.86

1 points   

QUESTION 52

1. Suppose we are interested in the relationship between age and job satisfaction, so we measure each for 100 people. Age and job satisfaction are recorded at separate times and are paired up later based on a participant number. What would happen if a researcher loses the participant number, cannot correctly pair participant data, and randomly pairs age and job satisfaction data?

   		SSx would be wrong
   		SSy would be wrong
   		SSxy (SP) would be wrong
   		All of the above

1 points   

QUESTION 53

1. As the sample size gets larger, what happens to the size of the correlation that is needed for significance?

   		It stays constant
   		It gets smaller
   		It also gets larger
   		There is no consistent relationship between sample size and the critical value for a significant correlation

1 points   

QUESTION 54

1. Under what circumstances is the phi-coefficient used?

   		When both variables consist of ranks
   		When both X and Y are dichotomous variables
   		When one variable consists of ranks and the other is continuous
   		When one variable is dichotomous and the other is continuous

1 points   

QUESTION 55

1. For the linear equation Y = 2X + 4, if X increases by 1 point, how much will Y increase?

   		1 points
   		2 points
   		3 points
   		4 points

1 points   

QUESTION 56

1. Why is a regression line referred to as the line of best fit? (choose the best answer)

   		If any other line were fitted to the data, SSx would increase
   		If any other line were fitted to the data, SSxy would increase
   		If any other line were fitted to the data, SSy would increase
   		If any other line were fitted to the data, the sum of squared residuals (the distance between each point and the regression line)would increase

1 points   

QUESTION 57

1. What is represented by the numerator used to calculate Pearson's correlation coefficient?

   		variability of x individually
   		variability of y individually
   		Covariance between variable x and variable y
   		unexplained variability

Answer 1