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Final

PSYC 2002 Study Guide - Final Guide: 5,6,7,8, Variance, Standard Deviation


Department
Psychology
Course Code
PSYC 2002
Professor
Bernadette Campbell
Study Guide
Final

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A characteristic, usually a numerical value, which describes a sample is called a _______.
a. statistic
A researcher records the change in weight (gain or lost) during the first semester of college
for each individual in a group of 25 freshmen and calculates the average change in weight.
The average is an example of a _______.
d. statistic
In a correlational study,
c. 2 variables are measured and there is only 1 group of participants.
In an experimental study,
b. 1 variable is measured and 2 groups are compared.
A researcher is curious about the average monthly cell phone bill for high school students
in Ontario. If this average could be obtained, it would be an example of a ______.
c. parameter
The relationship between a statistic and a parameter is the same as the relationship
between ______.
c. a sample and a population
Using the election results from a sample of n = 100 voters to predict the results for the
entire state is an example of inferential statistics.
b. True
What additional information is obtained by measuring two individuals on an ordinal scale
compared to a nominal scale?
a. The direction of the difference
Which of the following is an example of a continuous variable?
c. The amount of time to solve a problem
Which of the following is an example of a discrete variable?
a. The gender of each student in a psychology class
A biologist records the number of trout, bass, perch, and other types of fish caught in a
local lake during a 2-week period. If the results are organized in a frequency distribution
graph, what kind of graph should be used?
a. A bar graph
What is the shape of the distribution for the following set of data? Scores: 1, 2, 3, 3, 4, 4, 4
5, 5, 5, 5, 6
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a. Negatively skewed
The students in a psychology class seemed to think that the midterm exam was very easy. If
they are correct, what is the most likely shape for the distribution of exam scores?
b. Negatively skewed
What term is used to describe the shape of a distribution in which the scores pile up on the
left-hand side of the graph and taper off to the right?
b. Positively skewed
After 5 points are added to every score in a distribution, the mean is calculated and found
to be μ= 30. What was the value of the mean for the original distribution?
b. 25
Determining a person's occupation would involve measurement on a(n) __________ scale of
measurement.
d. nominal
In a histogram, the vertical (up and down) dimension shows
c. Frequencies
Which statement is true for the scores 1, 2, 3, 4, 5, 5, 7, 8, 9, 10?
d. The mean is greater than the median
A population of scores has μ= 50 and σ= 10. If 5 points are added to every score in the
population, then the new mean and standard deviation would be ____.
d. μ= 55 and σ= 10
Considering variance vs. standard deviation, which of the following statements is true?
c. Standard deviation is the preferred measure of variability because it is expressed in the same
units as the original scale
One sample of n = 4 scores has a mean of M = 10, and a second sample of n = 8 scores has a
mean of M = 20. If the two samples are combined for statistical analysis, the mean for the
combined sample will be ____.
c. greater than 15 but less than 20
A Canadian political scientist finds that the number of hours that members of a political
action group put into the group's activities each week was 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 35.
Upon examination of these scores, the researcher would probably decide that the most
useful measure of the typical value would be
c. The median
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A researcher measures 50 participants' eye movements as they read ambiguous words
embedded in sentences. Since participants' eye movements are measured in milliseconds,
and there are likely to be many different times measured, the researcher reasons that a
________ will best help make sense of the data.
b. grouped frequency table
After measuring two individuals, a researcher can say that Tom's score is greater than
Bill's, but cannot specify how much greater. The measurements must come from a(n)
__________ scale.
b. ordinal
An intelligence test includes 12 items. Thus, a person could get any number correct
between 0 and 12. Each of these numbers correct (0 to 12) that a person could possibly get
is called a
d. value
When is the mode the preferred measure of central tendency?
c. When your data are nominal
A set of 10 scores has SS = 90. If the scores are a sample, the sample variance is ____, and if
the scores are a population, the population variance is ____.
a. s2 = 9; σ2 = 10
The correct answer is: 145, 143, 145, 147An organizational psychologist surveys job
satisfaction among labourers and white-collar workers. (Job satisfaction is rated on a scale
from 1 = low satisfaction to 10 = high satisfaction.) Among labourers M= 4 and SD = 2, and
among white-collar workers M= 7 and SD=3. Which statement best describes what these
numbers mean?
a. Labourers are less satisfied on average than white-collar workers but there is more variability
in the satisfaction of white-collar workers Correct
Which of the following is not a characteristic of all z-score distributions?
a. The scores conform to a normal distribution
A population of scores has μ = 80. In this population, a score of X = 74 corresponds to z =
-3. What is the population standard deviation?
a. 2
Estimating the variance of a population from the sample, you cannot use the sample's
variance directly because
a. it tends to be slightly too small
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