1.
Refer to Exhibit 21. How many individual scores are in the entire set?
Exhibit 21
X
f
5
1
4
1
3
4
2
2
1
2
A) N = 5
B) N = 6
C) N = 10
D) impossible to determine from the information given
2.
What kind of frequency distribution graph is appropriate for scores measured on an interval or ratio scale?
A) only a histogram
B) only a polygon
C) either a histogram or a polygon
D) only a bar graph
3.
What kind of frequency distribution graph shows the frequencies as bars that are separated by spaces?
A) a bar graph
B) a histogram
C) a polygon
D) All of the other choices are correct.
4.
Frequency distribution polygons are intended for use with ____.
A) either interval or ratio scales of measurement
B) only ratio scales
C) either nominal or ordinal scales
D) only nominal scales
5.
A professor recorded the academic major for each student in an introductory psychology class. If the data are presented in a frequency distribution graph, what type of graph should be used?
A) a bar graph
B) a histogram
C) a polygon
D) either a histogram or a polygon
6.
In a normal shaped distribution, ____.
A) the scores pile up in the middle and taper off symmetrically to both sides.
B) the scores pile up on the righthand side and taper off to the left.
C) the scores pile up on the lefthand side and taper off to the right.
D) the scores are evenly distributed across the entire scale of measurement.
7.
A researcher is measuring problemsolving times for a sample of n = 20 children. However, one of the children fails to solve the problem, so the researcher has an undetermined score. What is the best measure of central tendency for these data?
A) the mean
B) the median
C) the mode
D) Central tendency cannot be determined for these data.
8.
Which of the following symbols identifies the sample standard deviation?
A) s
B)
C)
D)
9.
Changing the value of a score in a distribution will always change the value of the ____.
A) mean
B) median
C) mode
D) All of the other choices are correct.
10.
A population of N = 10 scores has a mean of . If 5 points are added to every score in the distribution, what is the value of the new mean?
A) still
B)
C)
D)
11.
A researcher is interested in the sleeping habits of American college students. A group of 50 students is interviewed and the researcher finds that these students sleep an average of 6.7 hours per day. For this study, the 50 students are an example of a ____.
A) parameter
B) statistic
C) population
D) sample
12.
A researcher is curious about the average IQ of registered voters in the state of Florida. If this average could be obtained, it would be an example of a ____.
A) sample
B) statistic
C) population
D) parameter
13.
Statistical techniques that summarize, organize, and simplify data are classified as ____.
A) population statistics
B) sample statistics
C) descriptive statistics
D) inferential statistics
14.
A researcher weighs each individual in a sample of 25 laboratory rats and calculates the average weight for the group. The average weight is an example of a ____.
A) parameter
B) statistic
C) variable
D) constant
15.
The average score for an entire population would be an example of a ____.
A) parameter
B) statistic
C) variable
D) constant
16.
In an experiment, the researcher manipulates the ____ variable and measures changes in the ____ variable.
A) population, sample
B) sample, population
C) independent, dependent
D) dependent, independent
