▶︎ Jump over to Khan academy for practice: Comparing data distributions

Refer to Khan academy: Two-way tables
Refer to Khan academy: Distributions in two-way tables
Refer to Khan academy: Marginal distribution and conditional distribution

Refer to youtube: Mean, Median, and Mode: Measures of Central Tendency: Crash Course Statistics #3
Refer to wikipedia: Central tendency
Refer to Khan lecture.

Refer to wiki: Benford’s law

It is an observation about the frequency distribution of leading digits in many real-life sets of numerical data.

Refer to Khan academy: Frequency tables & dot plots
Refer to Khan academy review: Dot plots and frequency tables review

Refer to Khan academy course.

Types of studies:

• Sample study: To estimate ONE certain parameter of a population.
• Observational studies: To compare TWO parameters of a population WITHOUT affecting them.