class 10 Flashcards
Complete the sentence: In a scatterplot, the ______ variable is measured on the horizontal axis and the ______ variable is on the vertical axis.
A. dependent; independent
B. independent; dependent
C. dependent; intervening
D. control; dependent
b
If no relationship exists between variables, Pearson’s r takes on the value of ______.
A. –1
B. 0
C. +1
D. either +0.5 or -0.5
b
A Pearson’s r value of .51 signifies a ______.
A. weak negative relationship
B. weak positive relationship
C. moderate positive relationship
D. moderate negative relationship
c
What the correlation coefficient is NOT:
A. A statistics measuring the strength of relationship between two variables.
B. A statistics dependent on the units of measurement of the variables.
C. A standardized statistics.
D. A symmetrical statistics.
b
What similarities and differences do two correlation coefficients of –0.30 and +0.30 display?
A. same strength, different direction.
B. same direction, different strength.
C. they cannot be compared without knowing if the variables under examination are the same.
D. they cannot be compared without knowing what the independent variable is and what the
dependent variable is.
a
Some studies demonstrate that when many people observe an accident, the victim is less likely
to receive assistance. What is the correlation between these variables?
A. small
B. large
C. negative
D. positive
c
A politician makes the following claim in a speech: “Correlational research has clearly shown that a lack of education causes people to turn to a life of drugs.” What is wrong with this politician’s claim?
A. Correlational research does not prove that one variable causes another.
B. The data to which the politician referred was based on a small sample size.
C. The politician misinterpreted the direction of the correlation.
D. It would be unethical to conduct correlational research on people’s drug use.
a
The rows in a mean comparison table represent:
A. the categories of the dependent variable
B. the categories of the independent variable
C. the categories of either the dependent or the independent variable
D. mean, standard deviation and total number of cases
b
When Larry watches professional football games on television, he notices that the number of penalties tend to increase as the game nears its end. Larry has observed a _____ correlation.
A. negative
B. positive
C. weak
D. strong
b
True or false: A mean comparison table is a table that shows the mean of a dependent
variable for cases that have different values on an independent variable.
true
True or false: A correlation coefficient of .56 is stronger than a correlation coefficient of –.65.
false
True or false: Two variables with a correlation of 0.3 have a stronger linear relationship than
two variables with a correlation of -0.7.
false
True or false: The correlation between variables A and B is the same as the correlation between B and A.
true
True or false: To examine the relationships between two quantitative variables graphically, we should create two histograms side by side.
false
True or false: A correlation of r=1.2 is not possible.
true
