Chi-square Test for Independence
Key concepts for understanding the Test for Independence.
Chi-square Tests Overview
Chi-square tests are very useful in understanding relationships and proportions. This is a concise overview.
Chi-square Test for Homogeneity
Key concepts of the Chi-square Test for Homogeneity – how it differs from the Test for Indpendence.
Chi-square Goodness of Fit Test
Key concepts in understanding the Chi-square Goodness of Fit test.
Why is a two-tail p-value twice the one-tail value?
The logic behind why a two-tail p-value is always twice the one-tail value.
Tail of the Test?
How to determine which side of the distribution to use in your hypothesis test.
What is p-value?
Understanding p-value is often a challenge for stats students. Here is a focused explanation.
2-Sample z-test
Excerpt for 2-sample z-test coming
Measurement Scales
This is a student’s question about the NOIR acronym for the most common measurement scales. Here is my answer:
Z or T?
Picking the right distribution to use for your hypothesis test is important. For comparing means, we use either the z or the t-distribution. Here’s how to choose the right one.