Practice TestTake a test on your terms and definitions
Spaced RepetitionScientifically backed study method
Matching GameHow quick can you match all your cards?
FlashcardsStudy terms and definitions
1 / 39
There's no tags or description
Looks like no one added any tags here yet for you.
40 Terms
1
Which of the following is not an example of descriptive statistics?
b. an estimate of the number of Alaska residents who have visited Canada.
New cards
2
A characteristic of interest for the elements is called a(n)
c. variable.
New cards
3
In a data set, the number of observations will always be the same as the number of
b. elements.
New cards
4
Categorical data
b. may be either numeric or nonnumeric.
New cards
5
In an application for a credit card, potential customers are asked for their social security numbers. A social security number is an example of a
a. categorical variable.
New cards
6
Temperature is an example of
b. a quantitative variable.
New cards
7
Statistical studies in which researchers do not control variables of interest are
d. observational studies.
New cards
8
Statistical studies in which researchers control variables of interest are
a. experimental studies.
New cards
9
The Department of Transportation of a city has noted that on average there are 14 accidents per day. The average number of accidents is an example of
a. descriptive statistics.
New cards
10
The process of analyzing sample data in order to draw conclusions about the characteristics of a population is called
b. statistical inference.
New cards
11
In a post office, the mailboxes are numbered from 1 to 5,000. These numbers represent
d. quantitative data.
New cards
12
Since a sample is a subset of the population, the sample mean
d. can be larger, smaller, or equal to the mean of the population.
New cards
13
In a stem-and-leaf display,
b. a single digit is used to define each stem, and one or more digits are used to define each leaf.
New cards
14
A frequency distribution is
c. a tabular summary of a set of data showing the number of items in each of several nonoverlapping classes.
New cards
15
In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to
c. the total number of elements in the data set.
New cards
16
The class width for the distribution of sick days taken by 200 factory workers is
b. is 5.
New cards
17
The number of workers who took at most 10 sick days per month is
c. was 185.
New cards
18
Qualitative data can be graphically represented by using a(n)
d. bar graph.
New cards
19
Fifteen percent of the students in a School of Business Administration are majoring in Economics, 20% in Finance, 35% in Management, and 30% in Accounting. The graphical device(s) that can be used to present these data is (are)
d. both a bar graph and a pie chart.
New cards
20
The total number of data items with a value less than or equal to the upper limit for the class is given by the
c. cumulative frequency distribution.
New cards
21
A common graphical presentation of quantitative data is a
a. histogram.
New cards
22
A tabular method that can be used to summarize the data on two variables simultaneously is called
b. a crosstabulation.
New cards
23
When the conclusions based upon the aggregated crosstabulation can be completely reversed if we look at the unaggregated data, the occurrence is known as
c. Simpson's paradox.
New cards
24
The interquartile range is the difference between the
b. first and third quartiles.
New cards
25
The value in the middle after the data has been arranged from smallest value to largest is called the
b. median.
New cards
26
If a data set has an even number of observations, the median
b. is the average value of the two middle items.
New cards
27
In computing the p th percentile, if the index i is an integer the pth percentile is the
a. data value in position i.
New cards
28
The first quartile is
b. is the same as the 25th percentile.
New cards
29
The measure of location that is most likely to be influenced by extreme values in the data set is the
d. mean.
New cards
30
The variance of the sample
a. can never be negative.
New cards
31
The value of the sum of the squared deviations from the mean must always be
d. at least zero.
New cards
32
The coefficient of variation is
d. None of the other answers are correct.
New cards
33
Which of the following symbols represents the mean of the population?
c. μ.
New cards
34
Which of the following symbols represents the variance of the population?
a. σ².
New cards
35
The symbol σ² is used to represent the
a. variance of the population.
New cards
36
Which of the following symbols represents the standard deviation of the population?
b. σ.
New cards
37
Chebyshev's theorem can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.
a. Chebyshev's theorem.
New cards
38
In a five-number summary, which of the following is not used for data summarization?
d. the mean.
New cards
39
A numerical measure of linear association between two variables is the
b. covariance.
New cards
40
An important numerical measure of the shape of a distribution is the
Studied by 0 people
