Question 1

If the null hypothesis is true, the standard error of the mean serves as a rough indicator of the average amount by which a control group mean would be expected to deviate from

Accepted Answer

A)  its population mean 
B)  the experimental group mean 
C)  the mean of all the participants who participated in the experiment 
D)  all of the above

Question 2

If scores in a distribution are not normally distributed, then

Accepted Answer

A)  sample means will not be normally distributed 
B)  sample means will be normally distributed if the sample size is 30 or more 
C)  the sample means will be inaccurate 
D)  statistical significance will not be achieved

Question 3

A nominal scale of measurement is used when numbers represent categories.

Accepted Answer

A) True 
 B)False

Question 4

If you have a matched pairs design, you should analyze your data using

Accepted Answer

A)  between-subjects t test 
B)  a within-subjects t test 
C)  analysis of variance 
D)  the Pearson r

Question 5

The standard deviation is the most common estimate of variability within a population.

Accepted Answer

A) True 
 B)False

Question 6

If you have 20 participants in a matched pairs design, you will have ___ degrees of freedom.

Accepted Answer

A)  20 
B)  19 
C)  18 
D)  9

Question 7

The symmetrical bell-shaped figure used to represent the frequency distribution of many physical and psychological characteristics is called a

Accepted Answer

A)  histogram 
B)  normal curve 
C)  percentile rank 
D)  scatterplot

Question 8

If you have 9 participants and 3 groups, your df total would be

Accepted Answer

A)  9 
B)  8 
C)  7 
D)  6

Question 9

Given that the population standard deviation equals 40 and that the sample consists of 25 observations, the standard error of the mean equals

Accepted Answer

A)  0.80 
B)  1.60 
C)  8.00 
D)  40.00

Question 10

If you have 9 participants and 3 groups, your df between would be

Accepted Answer

A)  9 
B)  6 
C)  3 
D)  2

Exam 16: Appendix E: Using Theory to Generate Research Hypotheses