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Chapter Quiz
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1
A dot plot shows
A)The general shape of a distribution
B)The mean, median, and mode
C)The relationship between two variables
D)The interquartile range.
2
The test scores for a class of 101 students are computed. What is the location of the test score associated with the third quartile?
A)75%
B)31
C)50.0
D)76.5
3
The test scores for a class of 50 students are computed. What is the location of the test score associated with the second decile?
A)20%
B)31
C)10.2
D)20.5
4
To draw a box plot that summarizes a data set,
A)Two values are required: 1st quartile, 3rd quartile,
B)Three values are required: minimum, median, and maximum
C)Four values are required: minimum, 1st quartile, 3rd quartile, and maximum
D)Five values are required: minimum, 1st quartile, median, 3rd quartile, and maximum
5
The inter quartile range of a set of observations is
A)The difference between the minimum and maximum values
B)The standard deviation.
C)The difference between the 1st and 3rd quartiles.
D)Appropriate only for symmetric distributions.
6
For any symmetric distribution
A)The mean, median, and mode are equal.
B)The mean is the largest measure of location.
C)The median is the largest measure of location.
D)The standard deviation is the largest value.
7
For a positively skewed distribution
A)The mean, median, and mode are equal.
B)The mean is the largest measure of location.
C)The median is the largest measure of location.
D)The standard deviation is the largest value.
8
For a negatively skewed distribution
A)The mean, median, and mode are equal.
B)The mean is the largest measure of location.
C)The mode is the largest measure of location.
D)The standard deviation is the largest value.
9
A coefficient of skewness of -2.73 was computed for a set of data. We conclude that
A)The mean is larger than the median.
B)The median is larger than the mean.
C)The standard deviation is a negative number.
D)The distribution is positively skewed.
10
The purpose of a contingency table is to summarize
A)Two continuous, ratio variables
B)Two discrete, ratio variables
C)Two discrete, nominal or ordinal variables.
D)Two discrete, continuous variables.
11
A scatter diagram:
A)Is a graphic tool designed to portray the relationship between two variables.
B)Uses interval or ratio scale data.
C)Does not allow negative values.
D)Both A and B are correct.
12
Contingency tables and scatter diagrams describe
A)Univariate data
B)Qualitative data
C)Bivariate data
D)Frequency data







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