Chapter 3 Part 2 Flashcards Preview

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Flashcards in Chapter 3 Part 2 Deck (14):
1

The___ is the average of the squares of the distance each value is from the mean.

population variance

2

The population variance is the ___.

squares of the distance each value is from the mean.

3

The____ is the square root of the variance.

population standard deviation

4

The population standard deviation is the____.

square root of the variance

5

A ____for a value is obtained by subtracting the mean from the value and dividing the result by the standard deviation.

z score or standard score

6

A z score or standard score for a value is obtained by _____.

subtracting the mean from the value and dividing the result by the standard deviation

7

______ divide the data set into 100 equal groups

Percentiles

8

Percentiles are?

divide the data set into 100 equal groups

9

_____ divide the distribution into four equal groups, denoted by Q1, Q2, Q3.

Quartiles

10

The___ is the difference between the third and first quartiles. IQR Q3 Q1

interquartile range

11

The interquartile range (IQR)

is the difference between the third and first quartiles\

12

A data set should be checked for extremely high or extremely low values. These values are called ___

Outliers

13

Ouliers are?

checked for extremely high or extremely low values

14

5 Steps for finding Quartiles?

1. Arrange data from lowest to greatest to find Q1 and Q3
2. Find IQR range Q3-Q1
3.Multiply IQR by 1.5
4.Subtract IQR range from Q1 and add IQR to Q3
5.