Quiz: Introduction to Statistics, Frequency Tables, and Graphs
Due Mar 27 at 11:59pm Points 60 Questions 20 Time Limit 60 Minutes
Instructions
The quiz:
Covers the Textbook material from Module 1: Week 1.
Contains 20 multiple-choice and true/false questions.
Is limited to 60 minutes.
Allows 1 attempt.
Is worth 60 points.
Submit this assignment by 11:59 p.m. (ET) on Monday of Module 1: Week 1.
Attempt History
Attempt Time Score
LATEST Attempt 1 32 minutes 54 out of 60
Correct answers are hidden.
Score for this quiz: 54 out of 60
Submitted Mar 27 at 4:06pm
This attempt took 32 minutes.
IncorrectQuestion 1
0 / 3 pts
Organizing a set of scores in a table or computing an average to summarize a data set is an
example of using ______.
parameters.
random sampling.
descriptive statistics.
inferential statistics.
Question 2
3 / 3 pts
Using polling results from a sample of 100 registered voters in Iowa to predict the outcome of a
statewide election set to take place one week later is an example of using inferential statistics.
True
False
Question 3
3 / 3 pts
If a set of scores is displayed using a smooth curve, which scale of measurement was used to
measure the scores?
nominal
interval
nominal or ordinal
interval or ratio
Question 4
3 / 3 pts
A professor records the number of students who are absent each day for the semester. Given the
scale of measurement used when measuring this variable, a bar graph should be used to show the
frequency distribution.
True
False
Question 5
3 / 3 pts
The amount of time that it takes a person to solve a problem is an example of a(n) _____
variable.
independent
nominal
continuous
discrete
Question 6
3 / 3 pts
A researcher surveys a sample of n = 10 adults and asks them to indicate their favorite day of the
week. If the data were organized in a frequency distribution table, what would be included in the
first column?
a list of students
a list of days of the week
a list of frequencies
a list of averages
Question 7
3 / 3 pts
A variable is a characteristic or condition that changes or has different values for different
individuals.
True
False
Question 8
3 / 3 pts
To determine the size of a difference between two individuals on a measured variable, a
researcher must use either an interval or a ratio scale of measurement.
True
False
Question 9
3 / 3 pts
Smooth curves and relative frequencies are more often used to describe population than sample
data.
True
False
Question 10
3 / 3 pts
If a set of exam scores forms a negatively skewed distribution, what can you likely conclude
about the students’ scores?
Most of the students had relatively high scores.
Most of the students had relatively low scores.
About an equal number of students had relatively high and relatively low scores.
It is not possible to draw any conclusions about students’ scores with this information.
Question 11
3 / 3 pts
What scale of measurement is being used when a researcher measures the amount of car
accidents that participants have been involved in during their lifetime?
nominal
ordinal
interval
ratio
Question 12
3 / 3 pts
A researcher interested in vocabulary development among toddlers obtains a sample of 2-year-
old children to participate in a research study. The average vocabulary development score for the
sample of toddlers is an example of a parameter.
True
False
Question 13
3 / 3 pts
The value of (ΣX)2 for the scores 1, 5, and 2 is 64.
True
False
Question 14
3 / 3 pts
The value of ΣX + 1 for the scores 1, 0, 2, and 4 is 10.
True
False
Question 15
3 / 3 pts
The value of ΣX2 for the scores 1, 0, 2, and 4 is 14.
True
False
Question 16
3 / 3 pts
For the following grouped frequency distribution table of exam scores, how many students had
scores lower than X = 75?
X f
95-99 6
90-94 3
85-89 4
80-84 5
75-79 2
70-74 1
2
3
6
1
IncorrectQuestion 17
0 / 3 pts
If the following grouped frequency distribution table pertaining to a continuous variable were
shown in a histogram, the width of the bar above the 15-19 interval would reach from _____ to
_____.
X f
20-24 2
15-19 5
10-14 4
5-9 1
X = 14.5 to X = 19.5
X = 15.5 to X = 18.5
X = 15.5 to X = 19.5
X = 15.0 to X = 19.0
Question 18
3 / 3 pts
What is the total number of scores for the distribution shown in the following table?
X f
4 7
3 5
2 4
1 2
4
10
18
39
Question 19
3 / 3 pts
Using the frequency distribution table below, what is the proportion of individuals that scored a
4?
X f
6 4
5 3
4 7
3 2
2 2
1 2
.2
.7
.35
.1
Question 20
3 / 3 pts
For the following grouped frequency distribution table, how many people have scores greater
than X = 45?
X f
60-69 4
50-59 3
40-49 7
