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Practice Questions and Answers for Psychology 253

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  • Course
  • Psychology 253
  • Institution
  • Stellenbosch University (SUN)
  • Book
  • Statistics for the Behavioral Sciences

This document will help you to better understand the work of the Psychology 253 module. It is composed of questions and answers that you can use to test yourself.

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  • July 7, 2021
  • 50
  • 2020/2021
  • Other
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  • practice questions
  • psychology
  • psych
  • statistics
  • stats
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  • questions
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Notes made by Michaela Goncalves
22587934




Questions from Text Book Plus
answers
Please note: it is important to go through the lecture podcasts as these notes do not
serve as an alternative to them. Please don’t send my notes to anyone because I worked
really hard to make these as in depth and easy to understand as possible :)


These are all from the textbook and I own nothing


Chapter 1: Introduction to statistics
I. A researcher is interested in the fast food eating habits of American college students.
A group of 50 students is interviewed and the researcher finds that these students eat
an average of 2.3 commercially prepared meals per week. For this study, the average
of 2.3 meals is an example of a _______.
a) Parameter
b) Statistic
c) Population
d) Sample
II. A researcher is curious about the average distance traveled by Canadian geese during
peak fall migration in the state of New York. The entire group of Canadian geese in the
state is an example of a _______.
a) Sample
b) Statistic
c) Population
d) Parameter
III. What term is used for the statistical techniques that use sample data to draw
conclusions about the population from which the sample was obtained?
a) Population statistics
b) Sample statistics
c) Descriptive statistics
d) Inferential statistics
IV. The SAT is standardised so that the average score on the verbal test is 500 each year.
If you select a group of 100 graduating seniors who have taken the verbal SAT, what
value would be obtained for their average score?
a) 500
b) Greater than 500
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,Notes made by Michaela Goncalves
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c) Less than 500
d) Around 500 but probably not equal to 500
V. What is an operational definition
a) A definition of a hypothetical construct
b) A method for measuring a hypothetical construct
c) A method for measuring and defining a hypothetical construct
d) None of the above
VI. A researcher studies the factors that determine the number of jobs adults have in a
lifetime. The variable, number of jobs, is an example of a(n) _________
a) Discrete
b) Continuous
c) Nominal
d) Ordinal
VII. When measuring height to the nearest half inch, what are the real limits for a score of
69.0 inches?
a) 68 and 70
b) 68.5 and 69.5
c) 68.75 and 69.75
d) 68.75 and 69.25
VIII. Ranking a group of cities in terms of “quality of life” would be an example of
measurement of a(n) ________ scale of measurement
a) Nominal
b) Ordinal
c) Interval
d) Ratio
IX. In a correlational study, how many variables are measured for each individual and how
many groups of individuals are in the study?
a) One variable and one group
b) One variable and two groups
c) Two variables and one group
d) Two variables and two groups
X. A research study comparing alcohol use for college students in the United States and
Canada reports that more Canadian student drink but American students drink more.
Which research design did this study use?
a) Correlational

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,Notes made by Michaela Goncalves
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b) Experimental
c) Non experimental
d) Non correlational
XI. A recent study reports that infant rats fed a diet containing genetically modified grains
reached an adult weight 10% greater than their litter mates raised on a regular diet.
For this study, what is the independent variable?
a) The rates given the genetically modified diet
b) The rats given the regular diet
c) The type of diet given to the rats
d) The adult weight of the rats
XII. What value is represented by the uppercase N?
a) The number of scores in a population
b) The number of scores in a sample
c) The number of values to be added in a summation problem
d) The number of steps in a summation problem
XIII.What is the value of ∑( X+1) for the following scores: 0,1,2,4
a) 8
b) 9
c) 11
d) 16
XIV. What is the last step in the calculation of (∑X)²?
a) Square each score
b) Add the score
c) Square the sum of the scores
d) Add the squared scores


Chapter 2: Frequency Distributions
I. If the following scores are placed in a frequency distribution table, then what is the
frequency value corresponding to X=2. Scores: 2, 3, 1, 1, 3, 3, 2, 4, 3, 1
a) 1
b) 2
c) 3
d) 4


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, Notes made by Michaela Goncalves
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II. For the following distribution of quiz scores, how many individuals
took the quiz? Scores on the right X f
a) 5 5 6
4 5
b) 10 3 5
2 3
c) 15
1 2
d) 21
III. For the following frequency distribution, what is the value of ∑X² ?
(Remember BEMDSAS) and scores on the right.
X f
a) 50
5 1
b) 55 4 0
3 2
c) 74 2 1
1 3
d) 225
IV. A set of scores ranges from a high of X=96 to a low of X=27. If these scores are
placed in a grouped frequency distribution table with an interval width of 10 points,
the top interval in the table would be _________
a) 90-99
b) 90-100
c) 91-100
d) 87-96
V. What is the lowest score in the following distribution X f

a) X=16 24-25 2
22-23 4
b) X=17 20-21 6
18-19 3
c) X=1 16-17 1
d) Cannot be determined
VI. Which of the following statements is false regarding grouped frequency distribution
tables?
a) An interval width should be used that yields about 10 intervals
b) Intervals are listed in descending order, starting with the highest value at the
top of the X column
c) The bottom score for each interval is a multiple of the interval width
d) The value for N can be determined by counting the number of intervals in
the X column
VII. Which of the following measuring scales are displayed by frequency distribution
polygons?
a) Either interval or ratio scales
b) Only ratio scales
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