CHAPTER 3

Question 1

 a single value that represents a data set.
 Its purpose is to locate the center of a data set.
 commonly referred to as an average.

Answer 1

Measures of Central Tendency

Question 2

 A set of data has only one mean
 Applied for interval and ratio data
 All values in the data set are included
 Very useful in comparing two or more data sets.
 Affected by the extreme small or large values on a data set
 Cannot be computed for the data in a frequency distribution with an open-ended class

Answer 2

Properties of Mean

Question 3

The only common measure in which all values plays an equal role meaning to determine its values you would need to consider all the values of any given data set.
X bar (for sample)
mu (for population)

Answer 3

Arithmetic Mean (Mean)

Question 4

Other Types of Mean

Answer 4

Weighted mean
Geometric mean
Combined mean

Question 5

 It is useful when various classes or groups contribute differently to the total
 It is found by multiplying each value by its corresponding weight and dividing by the sum of the weights.

Answer 5

Weighted Mean

Question 6

 To determine the average percents, indexes, and relatives;
 to establish the average percent increase in production, sales, or other business transaction or economic series from one period of time to another.

Answer 6

Geometric Mean

Question 7

 The grand mean of all the values in all groups when two or more groups are combined.

Answer 7

Combined Mean

Question 8

 The midpoint of the data array

Answer 8

Median

Question 9

is a data set arranged in order whether ascending or descending

Answer 9

Data Array

Question 10

 It is unique, there is only one median for a set of data
 It is found by arranging the set of data from lowest or highest (or highest to lowest) and getting the value of the middle observation
 It is not affected by the extreme small or large values.
 It can be computed for an-open ended frequency distribution
 It can be applied for ordinal, interval and ratio data

Answer 10

Properties of Median

Question 11

 If n is odd, the median is the middle ranked
 If n is even, then the median is the average of the two middle ranked values

Answer 11

Median for Ungrouped Data

Question 12

 The value in a data set that appears most frequently

Answer 12

Mode

Question 13

fill in the blanks
A data may not contain any mode if none of the values is ______

Answer 13

most typical.

Question 14

with 1 mode

Answer 14

unimodal

Question 15

2 modes

Answer 15

Bimodal

Question 16

with more than 2 modes

Answer 16

multimodal

Question 17

without mode

Answer 17

No mode

Question 18

 It is found by locating the most frequently occurring value
 the easiest average to compute
 There can be more than one mode or even no mode in any given data set
 It is not affected by the extreme small or large values
 It can be applied for nominal, ordinal, interval and ratio data

Answer 18

Properties of Mode

Question 19

 The average of the lowest and highest value in a data set

Answer 19

Midrange

Question 20

 It is easy to compute.
 It gives the midpoint.
 It is unique.
 It is affected by the extreme small or large values.
 It can be applied for interval and ratio data.

Answer 20

Properties of Midrange