Chapter 3
Describing Data: Numerical Measures
True/False
1.
A value that is typical or representative of the data is referred to as a measure of central location.
Answer: True
Difficulty: Easy
Goal: 1
2.
The arithmetic mean is the sum of the observations divided by the total number of observations.
Answer: True
Difficulty: Easy
Goal: 1
3.
For a set of data arranged or sorted in numerical order, the value of the observation in the center is
called the weighted mean.
Answer: False
Difficulty: Easy
Goal: 1
4.
A set of ordinal, interval or ratio level data may only have one mode.
Answer: False
Difficulty: Easy
Goal: 1
5.
If a variable is measured at the interval or ratio level, all the values are included when computing the
mean.
Answer: True
Difficulty: Easy
Goal: 2
AACSB:
EU
6.
A variable measured at the interval or ratio level can have more than one arithmetic mean.
Answer: False
Difficulty: Easy
Goal: 2
7.
The mode is the value of the observation that appears most frequently.
Answer: True
Difficulty: Easy
Goal: 1
8.
A distribution that has the same shape on either side of the center is said to be symmetrical.
Answer: True
Difficulty: Easy
Goal: 3
9.
A negatively skewed distribution is not symmetrical. The long tail is to the left or in the negative
direction.
Answer: True
Difficulty: Easy
Goal: 3
10.
The geometric mean is the nth root of n observations.
Answer: True
Difficulty: Medium
Goal: 1
Statistical Techniques in Business & Economics, Lind/Marchal/Wathen, 13/e
1
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11.
A statistic is a measurable characteristic of the population.
Answer: False
Difficulty: Easy
Goal: 1
12.
A parameter is a measurable characteristic of a sample.
Answer: False
Difficulty: Easy
Goal: 1
13.
The median can be determined for any set of intervallevel data.
Answer: True
Difficulty: Easy
Goal: 2
14.
Extremely high or low scores affect the value of the median.
Answer: False
Difficulty: Easy
Goal: 2
15.
The sum of the deviations from the mean for the set of numbers 4, 9 and 5 will equal zero.
Answer: True
Difficulty: Easy
Goal: 2
16.
For salaries of $102,000, $98,000, $45,000, $106,000 and $101,000, the arithmetic mean would be an
appropriate average.
Answer: False
Difficulty: Easy
Goal: 2
AACSB:
REF
17.
Three persons earn $8 an hour, six earn $9 an hour, and one earns $12 an hour.
The weighted mean
hourly wage is $9.
Answer: True
Difficulty: Medium
Goal: 1
AACSB:
AS
18.
For any distribution, there are an equal number of values above the mean and
below it.
Answer: False
Difficulty: Easy
Goal: 2
19.
For a data set with an even number of ungrouped values, the median is the arithmetic mean of the two
middle values.
Answer: True
Difficulty: Easy
Goal: 1
20.
For a data set with an even number of ungrouped values, half of the values will be less than the
median.
Answer: True
Difficulty: Easy
Goal: 1
21.
In a negatively skewed distribution, the mean is always greater than the median.
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 Spring '10
 BARCUS
 Standard Deviation, Mean, Medium Goal, Easy Goal

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