Lesson 5: Measure of Variability

Question 1

3 measures of dispersion

Answer 1

1. range
2. quartile
3. standard deviation

Question 2

_________ is the spread of your data from the lowest to the highest value in the distribution.

Answer 2

Range

Question 3

Divide the data into four equal parts

Answer 3

quartile

Question 4

to know which partitioned is concentrated with the data

Answer 4

box plot

Question 5

Excel formula for standard deviation

Answer 5

=STDEV.P (dataset)

Question 6

is a statistic that measures the dispersion of a dataset relative to its mean

Answer 6

Standard deviation

Question 7

the most popular measure of dispersion

Answer 7

standard deviation

Question 8

it is denoted by greek letter sigma

Answer 8

standard deviation

Question 9

The empirical rule:

Answer 9

1. 68% of data are within 1 standard deviation
2. 95% within of data are within 2 standard deviation
3. 99.7% of data are within 3 standard deviation

Question 10

Formula of Frequency distribution converted to probability distribution

Answer 10

Frequency/total samples

i.e. 5/1000 = 0.005

Question 11

Indicates how many standard deviation from the mean

Answer 11

Z-score

Question 12

Allows us to “standardize” data for comparison

Answer 12

Z-score

Question 13

Let us help to know the difference between the two distribution

Answer 13

Standard deviation & mean