Ch 2 Measures of Central Tendency

Question 1

The prime measure of central tendency is the

Answer 1

mean

Question 2

Here is a table showing 18 rents. Monthly rents $975 $850 $1025 1100 1000 950 1000 925 1050 850 925 950 975 1000 1000 1025 1050 1100 What is the modal rent?

Answer 2

The Modal is $1,000

Question 3

The symbol ______ stands for “the sum of.”

Answer 3

Sigma

Question 4

Here is a table showing 10 GRMs. GRMs 98.5 93.6 112.8 122.0 104.2 91.7 98.8 114.2 117.9 123.5 What is the median GRM?

Answer 4

108.5. First you must array them in order: 91.7, 93.6, 98.5, 98.8, 104.2, 112.8, 114.2, 117.9, 122, 123.5. There are 10 numbers in the array. The formula to find the median is n + 1 ÷ 2. 10 + 1 ÷ 2 = 5.5. The median is the number that is halfway between the 5th and 6th from either end. Count in from either end and the 5th and 6th numbers are 104.2 and 112.8. The number that lies halfway between 104.2 and 112.8 is 108.5. That’s the median.

Question 5

“The listing of a set of observations, such as sales ratios, in a specific order, e.g., alphabetical, alpha-numeric, chronological, order of magnitude” is the definition of

Answer 5

array. An array is list of numbers in order (from low to high or high to low).

Question 6

A decile divides the data into ___ equal parts.

Answer 6

10

Question 7

The symbol for a variant is

Answer 7

X

Question 8

“In statistics, a subset of a population selected for analysis” is the definition of

Answer 8

sample

Question 9

Every distribution of numbers has a(n) ____________ but there may not be a _____________.

Answer 9

mean and median, mode

Question 10

Here is a table showing 10 GRMs. GRMs 98.5 93.6 112.8 122.0 104.2 91.7 98.8 114.2 117.9 123.5 What is the mean GRM?

Answer 10

107.7. f CLEAR S 98.5 S+ 93.6 S+ 112.8 S+ 122 S+ 104.2 S+ 91.7 + 98.8 S+ 114.2 S+ 117.9 S+ 123.5 S+ g

Question 11

The most frequently occurring value in an array of numbers is the

Answer 11

mode

Question 12

True or False: Fractiles are intervals that total 100% of the distribution.

Answer 12

TRUE

Question 13

“A number that describes a characteristic of a population” is the definition of

Answer 13

parameter. A parameter is the term we use to define a characteristic of a population. A parameter could be number of square feet.

Question 14

“The central point, or representative value, around which items cluster in a frequency distribution” is the definition of

Answer 14

central tendency

Question 15

Here is a table showing 18 rents. Monthly rents $975 $850 $1025 1100 1000 950 1000 925 1050 850 925 950 975 1000 1000 1025 1050 1100 What is the median rent?

Answer 15

1000. First you must array them in order: 850, 850, 925, 925, 950, 950, 975, 975, 1000, 1000, 1000, 1000, 1025, 1025, 1050, 1050, 1100, 1100. There are 18 numbers in the array. The formula to find the median is n + 1 ÷ 2. 18 + 1 ÷ 2 = 9.5. The median is the number that is halfway between the 9th and 10th from either end. Count in from either end and the 9th and 10th numbers are 1000 and 1000. The number that lies halfway between 1000 and 1000 is 1000. That’s the median.

Question 16

The _______ describes the central position in an array.

Answer 16

median

Question 17

Here is a table showing 10 GRMs. GRMs 98.5 93.6 112.8 122.0 104.2 91.7 98.8 114.2 117.9 123.5 What is the mean GRM?

Answer 17

107.7. f CLEAR S 98.5 S+ 93.6 S+ 112.8 S+ 122 S+ 104.2 S+ 91.7 + 98.8 S+ 114.2 S+ 117.9 S+ 123.5 S+ g

Question 18

Parameters are used to characterize a __________; statistics are used to measure a ___________.

Answer 18

population, sample

Question 19

What is the mode in the following list of rental amounts for two-bedroom apartments? $850, $885, $910, $825, $800, $900, $925

Answer 19

there is no mode

Question 20

“In statistics, a population or entire body of data” is the definition of

Answer 20

universe

Question 21

Here is a table showing 18 rents. Monthly rents $975 $850 $1025 1100 1000 950 1000 925 1050 850 925 950 975 1000 1000 1025 1050 1100. What is the mean rent?

Answer 21

986.11. f CLEAR S 975 S+ 850 S+ 1025 + 1100 S+ 1000 S+ 950 S+ 1000 S+ 925 S+ 1050 S+ 850 S+ 925 S+ 950 S+ 975 S+ 1000 S+ 1000 S+ 1025 S+ 1050 S+ 1100 S+ g Answer is $986.11

Question 22

Looking for a central tendency is part of xx

Answer 22

descriptive statistics.

Question 23

In statistics, a population or entire body of data; used to distinguish between a population and a sample obtained from the population. Population is a more generally used term.

Answer 23

Universe

Universe is also commonly called population.

Question 24

In statistics, a subset of a population selected for analysis. defines

Answer 24

Sample

Question 25

1. A constant or value used to index a function, such as use of degrees of freedom to derive an appropriate t-statistic or F-statistic function.
2. A number that describes a characteristic of a population. defines

Answer 25

parameter

Question 26

The sum of all the observations within a population; e.g., the aggregate sale price of all the houses sold in a given community. defines

Answer 26

Aggregate

Question 27

xx intervals that total 100% of the distribution.

Answer 27

Fractiles are

Question 28

A quartile is equal to

Answer 28

one-fourth of the data set

Question 29

A x divides the data set into 10 equal parts. That becomes useful if you have a x data set.

Answer 29

decile
large