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### Course: Statistics and probability > Unit 6

Lesson 3: Sampling methods# Samples and surveys

When we collect data it's important to know what type of data we're collecting and how to collect it properly.

## Problem 1: Qualitative and quantitative data

A survey was given that included data on each student's field of interest, age in years, number of languages spoken, and handedness.

David | Becca | Paige | ... | |
---|---|---|---|---|

Field of interest | computer science | journalism | chemistry | ... |

Age (years) | ... | |||

Languages spoken | ... | |||

Handed | right | left | right | ... |

## Problem 2: Representative samples

## Problem 3: Sampling methods

Willy wants to find what percent of students at his school drink the milk after they finish their cereal. He is considering the following sampling methods:

## Problem 4: Biased wording in survey questions

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