Topic 2: Descriptive Statistics I

Question 1

Cumulative Frequency

Answer 1

Total number or position below a certain number

Question 2

Calculate the cumulative frequency of each row

Answer 2

Question 3

Relative Frequency

Answer 3

f_rel = f/N

Question 4

Percentage Frequency

Answer 4

f_per = f/N * 100%

Question 5

Bivariate Frequency distribution

Answer 5

Two measures per observation

Question 6

Give an example of a bivariate frequency distribution

Answer 6

Question 7

Marginal Frequency

Answer 7

The sum on one row of the columns.

Question 8

Sample size

Answer 8

Sum of marginal frequencies

Question 9

Bivariate Relative Frequency distribution

Answer 9

Divide every entry of the table by the total number N

Question 10

What are the steps to construct a Frequency distribution?

Answer 10

1) Number of classes = sqrt(N) and round down
2) start point = lowesValue - (precision data/2)
3) end point = highestValue - (precision data/2)
4) classInterval = (endPoint - startPoint)/numClasses

(round up)

Question 11

Precision Data

Answer 11

The smallest unit/precision to which numbers are round.

Question 12

What is the precision point of the following data:

1. [1,4,32,100]
2. [3.0, 5.6, 77, 100.4]

Answer 12

1. 1
2. 0.1

Question 13

Do A1, #2 a)

Question 14

Bar Chart

Answer 14

• Separated by a space
• height = frequency
• Total height = N

Question 15

Histogram

Answer 15

• Area = frequency
  
  • More area = more frequency
• Total area = N
• No space

Question 16

Frequency Polygone

Answer 16

• Histogram with lines joining the mid-points of each column.

Question 17

Do A1 #2, b