Measures Of Center

Question 1

Arithmetic mean

Answer 1

A common data summary is the arithmetic mean or mean (also called average), computed as the data values’ sum divided by the number of values.

Question 2

average

Answer 2

A common data summary is the arithmetic mean or mean (also called average), computed as the data values’ sum divided by the number of values.

Question 3

mean

Answer 3

A common data summary is the arithmetic mean or mean (also called average), computed as the data values’ sum divided by the number of values.

Question 4

median

Answer 4

Another common data summary is the median, which is the middle value in the sorted list of data values.

Question 5

outlier

Answer 5

An outlier is a data value that is either much greater than or much less than the rest of the data and not representative of the rest of the data being considered.

Question 6

Mode

Answer 6

Mode is another measure of center, being the most frequently-occurring value.

Question 7

maximum

Answer 7

A simple measure of spread is to report the minimum and maximum values, typically along with a measure of center like mean or median.

Question 8

minimum

Answer 8

A simple measure of spread is to report the minimum and maximum values, typically along with a measure of center like mean or median.

Question 9

range

Answer 9

Another simple measure of spread is range, which reports the difference between the maximum and minimum values.

Question 10

MAD

Answer 10

Mean absolute deviation (MAD) is the mean of the absolute difference between each value and the values’ mean.

Question 11

Mean absolute deviation

Answer 11

Mean absolute deviation (MAD) is the mean of the absolute difference between each value and the values’ mean.

Question 12

Standard deviation

Answer 12

Standard deviation is the square root of the variance.

Question 13

Variance

Answer 13

Variance is ∑ni=1(di−mean)2n−1∑i=1n(di−mean)2n−1, where di is a data value and n is the number of data values.

Question 14

unit area histogram

Answer 14

A unit area histogram has rectangle heights equal to the bin frequency divided by the bin size.

Question 15

unimodal distribution

Answer 15

A unimodal distribution occurs when there is one (uni) prevalent peak (mode) in the histogram.

Question 16

class

Answer 16

A class is either a value of a categorical variable or an interval of a continuous variable.

Question 17

frequency distribution

Answer 17

A frequency distribution is a table that displays how often an outcome occurs for a sample.

Question 18

frequency

Answer 18

The frequency of a class is the number of events or values that fall under each class.

Question 19

bin

Answer 19

A histogram depicts data values by splitting a continuous variable into a number of class intervals, each known as a bin.

Question 20

class intervals

Answer 20

A histogram depicts data values by splitting a continuous variable into a number of class intervals, each known as a bin.

Question 21

histogram

Answer 21

A histogram depicts data values by splitting a continuous variable into a number of class intervals, each known as a bin.

Question 22

experiment

Answer 22

An experiment is a procedure that results in one out of a number of possible outcomes.

Question 23

outcome

Answer 23

An outcome is the result of an experiment.

Question 24

sample space

Answer 24

The set of all possible outcomes is called the sample space of the experiment.

Question 25

compound event

Answer 25

A compound event is a subset of the sample space consisting of more than one outcome.

Question 26

event

Answer 26

A subset of the sample space is called an event.

Question 27

simple event

Answer 27

A simple event is a subset with a single outcome.