Population vs Sample
Population A set of all elements about which we wish to draw conclusions
Sample A subset of the elements of a population
Population parameters are difficult to calculate
1) High cost The 2020 Census will have cost roughly $13.7 billion by the tim
2) impracticable
Two branches of Statistics
Descriptive Statistics: The science of describing the important aspects of a set of measurements
Statistical Inference: The science of using a sample of measurements to make generalizations about the
Business analytics:Descriptive analytics , Predictive Analytics, and Prescriptive Analytics.
Practice Questions
1 What is population
A set of all elements about which we wish to draw conclusions
2 What is sample
A subset of the elements of a population
3 Why population parameters are difficult to calculate
1) High cost
2) impracticable
4 What are the two branches of Statistics?
Descriptive Statistics: The science of describing the important aspects of a set of measurements
Statistical Inference: The science of using a sample of measurements to make generalizations about the
Mock Exam Practice
Q1-4
, roughly $13.7 billion by the time its activity ends in 2024 (US)
a set of measurements
make generalizations about the important aspects of a population of measurements
set of measurements
ake generalizations about the important aspects of a population of measurements
,One Categorical Variable - Frequency distribution
Mode of Transportation Frequency
Bicycle 111
Drive_Alone 57
Public_Transit 273
Walk 141
Other 18
Two Categorical Variables - Contingency table
, Personality
Sex Analyst
Female 55
Male 61
Total 116
Clustered Bar Chart
250 Female Male
210
194
200
164 160
Frequency
150
100 79 77
55 61
50
0
Analyst Diplomat Explorer Sentinel
Personality
One Numerical Variable - Frequency Distribution
Intervals Frequency Relative Frequency
100<x<=200 9 0.225
200<x<=300 16 0.4
300<x<=400 8 0.2
400<x<=500 4 0.1
500<x<=600 2 0.05
600<x<=700 1 0.025
40 1
Intervals:mutually exclausive;
Population A set of all elements about which we wish to draw conclusions
Sample A subset of the elements of a population
Population parameters are difficult to calculate
1) High cost The 2020 Census will have cost roughly $13.7 billion by the tim
2) impracticable
Two branches of Statistics
Descriptive Statistics: The science of describing the important aspects of a set of measurements
Statistical Inference: The science of using a sample of measurements to make generalizations about the
Business analytics:Descriptive analytics , Predictive Analytics, and Prescriptive Analytics.
Practice Questions
1 What is population
A set of all elements about which we wish to draw conclusions
2 What is sample
A subset of the elements of a population
3 Why population parameters are difficult to calculate
1) High cost
2) impracticable
4 What are the two branches of Statistics?
Descriptive Statistics: The science of describing the important aspects of a set of measurements
Statistical Inference: The science of using a sample of measurements to make generalizations about the
Mock Exam Practice
Q1-4
, roughly $13.7 billion by the time its activity ends in 2024 (US)
a set of measurements
make generalizations about the important aspects of a population of measurements
set of measurements
ake generalizations about the important aspects of a population of measurements
,One Categorical Variable - Frequency distribution
Mode of Transportation Frequency
Bicycle 111
Drive_Alone 57
Public_Transit 273
Walk 141
Other 18
Two Categorical Variables - Contingency table
, Personality
Sex Analyst
Female 55
Male 61
Total 116
Clustered Bar Chart
250 Female Male
210
194
200
164 160
Frequency
150
100 79 77
55 61
50
0
Analyst Diplomat Explorer Sentinel
Personality
One Numerical Variable - Frequency Distribution
Intervals Frequency Relative Frequency
100<x<=200 9 0.225
200<x<=300 16 0.4
300<x<=400 8 0.2
400<x<=500 4 0.1
500<x<=600 2 0.05
600<x<=700 1 0.025
40 1
Intervals:mutually exclausive;
