jeussantiago/dsc-measures-of-dispersion-quiz-nyc-ds-career-031119

Measures of Dispersion - Quiz

Objectives

You will be able to:

• Describe the significance of calculating measures of dispersion for continuous data
• Understand the formula and intuition behind mean absolute deviation, standard deviation and variance
• Understand the formula and intuition behind quantiles/quartiles and percentiles
• Understand and interpret Interquartile distances with box plots

???

Summary statistics for two samples of data are

Sample 1:
mean = 19 variance = 10

Sample 2:
mean = 10 variance = 19 Which sample has the larger spread of observations?

?: Which sample has the larger spread of observations?

() Sample 1

(X) Sample 2

?: Consider the following ordered set of data:

4 4 4 9 5 0 5 1 5 3 5 7 5 8 6 2 6 6 6 6 6 8 7 1 7 5 7 7 8 0 8 5

What is the InterQuartile Range (IQR) for this dataset?

() 2

(X) 3

() 3.5

() 4.25

Imagine that the number of marriages registered over a 10 year period were as follows:

Table 1. Number of registered marriages

Year	Number of Marriages
1	40,650
2	40,812
3	41,300
4	41,450
5	39,594
6	40,734
7	39,993
8	38,814
9	37,828
10	35,716

?: What is the median number of marriages?

() 41,886

() 38,997

() 39,594

(X) 40,321

?: Select the upper and lower quartile values from the list below:

[X] 38.814

[] 36.227

[X] 40.812

[] 41.812