Statistics

Question 1

Types of data ?

Answer 1

1. Categorical data

2. Numerical data

Question 2

Subtypes of categorical dats ?

Answer 2

1. Nominal
2. Ordinal
3. Binary

Question 3

Subtypes of numerical data?

Answer 3

1. Discrete

2. Continuous

Question 4

Examples of Categorical data ?

Answer 4

1. Nominal - Blood groups
2. Ordinal - Intubation grade
3. Binary - Tossing a coin & MTF questions

Question 5

Examples of numerical data ?

Answer 5

1. Discrete or interval data - Shoe size

2. Continuous data - Measurement - Heights

Question 6

Average value for numerical data ?

Answer 6

• Mode - Most common value
• Median - The middle value
• Mean - The average

Question 7

Median?

Answer 7

• Odd number of values, it is the central observation (n+1/2)
• Even number of values it is the arithmetic mean of central two values
• Useful is skewed distribution

Question 8

Mean?

Answer 8

• Useful in symmetric distribution

- Least useful in skewed distribution

Question 9

Confidence interval (CI) around the mean?

Answer 9

1. The larger the sample size, the more reliable the population mean