Qualitative and quantitative data

Telling qualities from quantities, and how the type fixes charts and averages.

Discrete and continuous data

Counts that move in steps against measurements that can take any value.

Primary and secondary data

Data collected yourself against someone else's records, and what each costs.

Data collection sheets

Designing collection sheets whose classes cover every value without overlapping.

Writing questionnaire questions

Non-overlapping response boxes, and the leading question that skews replies.

Practice

Qualitative and quantitative data

Telling qualities from quantities, and how the type fixes charts and averages.

Practice

Discrete and continuous data

Counts that move in steps against measurements that can take any value.

Practice

Primary and secondary data

Data collected yourself against someone else's records, and what each costs.

Practice

Data collection sheets

Designing collection sheets whose classes cover every value without overlapping.

Practice

Data collection review

Data types, collection sheets and questionnaire flaws.

Mixed review