Question 1

When you reject the null hypothesis,

Accepted Answer

A)  you have statistically significant results. 
B)  you have statistically insignificant results. 
C)  you have a 50% chance of making an error. 
D)  you also reject the research hypothesis.

Question 2

In a normal distribution, most scores fall near the ____ of the distribution, and the number of scores gradually ____ as one moves away from the mean.

Accepted Answer

A)  low end; increases 
B)  center; declines 
C)  center; increases 
D)  high end; declines

Question 3

Which of the following correlation coefficients represents the STRONGEST association between two variables?

Accepted Answer

A)  -.88 
B)  -.42 
C)  +.30 
D)  +.65

Question 4

Professor Latimore gives an exam that turns out to be exceptionally easy and everyone does well, yielding a

Accepted Answer

A)  normal distribution. 
B)  negatively skewed distribution. 
C)  positively skewed distribution. 
D)  bimodal distribution.

Question 5

Which of the following correlations will yield the highest coefficient of determination?

Accepted Answer

A)  -.70 
B)  -.40 
C)  .30 
D)  .50

Question 6

A frequency polygon is a

Accepted Answer

A)  graph that represents a symmetrical or bell-shaped curve. 
B)  bar graph that presents data from a frequency distribution. 
C)  line figure that presents data from a frequency distribution. 
D)  graph in which paired scores for each subject are plotted as single points.

Question 7

When a correlation is perfect, the data points in a scatter diagram

Accepted Answer

A)  form a bell-shaped curve. 
B)  fall in a straight line. 
C)  scatter in a symmetric oval. 
D)  scatter in a perfect circle.

Question 8

Scores pile up at the low end of the scale in

Accepted Answer

A)  a negatively skewed distribution. 
B)  a positively skewed distribution. 
C)  any skewed distribution. 
D)  a normal distribution.

Question 9

When a distribution of scores is not symmetrical and many scores pile up at the low end of the scale, the distribution is a

Accepted Answer

A)  positively skewed distribution. 
B)  negatively skewed distribution. 
C)  significant distribution. 
D)  normal distribution.

Question 10

The pattern in which many human characteristics are dispersed in the population that is represented by a symmetrical or bell-shaped curve is referred to as the

Accepted Answer

A)  significant distribution. 
B)  common distribution. 
C)  normal distribution. 
D)  skewed distribution.

Exam 35: Statistical Methods