Web Center for Social Research Methods
Research Methods Knowledge Base: Survey Question Wording
Discusses how to effectively word questions on surveys.
Sophia Learning
Sophia: Handling Laboratory Samples: Lesson 2
This lesson will explain the techniques and glassware used to "deliver" samples versus measure and "contain" samples. It is 2 of 3 in the series titled "Handling Laboratory Samples."
Shmoop University
Shmoop: Basic Statistics & Probability: Box & Whisker Plots
Students learn about box and whisker plots. Notes, examples, and practice exercises are included in the statistics resource.
Sophia Learning
Sophia: Unbiased Sampling Methods: Lesson 1
This lesson will define the term unbiased sample, and present the different types of unbiased sampling methods (e.g. simple random sample, stratified random sample, systematic random sample). It is 1 of 4 in the series titled "Unbiased...
Web Center for Social Research Methods
Research Methods Knowledge Base: Probability Sampling
This site from Cornell University contains great information on random or probability sampling. Definitely a site worth checking out on the subject.
Varsity Tutors
Varsity Tutors: Hotmath: Statistical Questions
Explains what a statistical question is and when and how central tendency and the spread of the data are relevant.
Other
Minitab: Comparison of Categorical and Quantitative Variables
This resource explains the difference between categorical and quantitative variables and provides examples of each.
Interactive Mathematics
Interactive Mathematics: Intoduction to Probability Theory
This tutorial defines experiment, sample space, and event. Several examples are presented to help distinguish between them.