## Part 1 - Further Mathematics - Unit 3 - DATA ANALYSIS - Types of data

**Rule of 👍🏼**

If you can calculate the **mean** of the data, then the data is numerical.

**Categorical data** written in **number** form:

* House numbers

* Phone numbers

* Date of birth

* Postcodes

**Check your understanding**

**Q1**

The variables *Country* (Australia, China, India) and *Surface area* (number of square kilometres)

**A** are both categorical.

**B** are both numerical.

**C **are categorical and numerical respectively.

**D** are numerical and categorical respectively.

**E **are categorical nominal and categorical ordinal respectively.

**Q2**

The variables *Month* (January, February, March) and *Monthly sales* ($)

**A** are both categorical.

**B** are both numerical.

**C** are numerical and categorical respectively.

**D **are categorical and numerical respectively.

**E **are categorical nominal and categorical ordinal respectively.

**Q3**

The variables *level of water usage* (L per day) and *size of house* (m2)

**A** are both categorical.

**B **are both numerical.

**C** are categorical and numerical respectively.

**D** are numerical and categorical respectively.

**E **are neither categorical are both nor numerical.

**Q4**

The level of water usage of 250 houses was rated in a survey as low, medium or high and

the size of the houses as small, standard or large.

The variables, *level of water usage* and *size of house*, as recorded in this survey, are

**A** both numerical variables.

**B**** **both categorical variables.

**C** neither numerical nor categorical variables.

**D** numerical and categorical variables respectively.

**E **categorical and numerical variables respectively.

**Answers**

**Q1 C **are categorical and numerical respectively.

**Q2 D** are categorical and numerical respectively.

**Q3 B** are both numerical.

**Q4 ****B**** **both categorical variables.

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