Descriptive Statistic For Caterhorical Data

Question 1

Types of variables?

Answer 1

Categorical ( qualitative)
1. Nominal scale: no natural order of values ex race, blood groups
2. Ordinal scale : natural ordering ex ranking better/good / best

Quantitative (numerical)
1.discrete- whole number takes integer values ex: number of deaths
Continuous- takes on many values may be decimal ex: mass

Question 2

Descriptive statistics

Answer 2

Data are only used for descriptive purposes and not employed to make predictions . Make large quantities of data understandable

Question 3

Inferential

Answer 3

Employs data in order to make inferences or make conclusions about 1 or more population from which the samples have been derived

Question 4

Uses of descriptive statistics

Answer 4

Identify missing data, errors in measurement
Assess the validity of assumptions needed for more formal ( inferential) analysis
Understand relationships between variables

Question 5

Tools for descriptive statistics

Answer 5

Visual display - tables , graphs/charts
Numerical summaries - measures central tendencies and variability

Question 6

How are categorical variables summarized

Answer 6

Usually in percentages and proportion
1. Frequency tables
2. Bar charts

Question 7

Types of frequency tables

Answer 7

Two way frequency tables
One way frequency tables