χ²-Test and Estimation of One Population Variance

Length: 23 minutesAuthor: JasonComplexity: Standard

When questions are focused on finding an unknown population variance or standard deviation, then the chi-squared statistic is used. This question and solution includes a hypothesis test and an estimation as well as how to read the chi-squared table.

13.5 | z-Test of Proportions (CASE 2)

Length: 20 minutesAuthor: Jason

The CASE 2 z-test of proportion can check to see if the proportion of individuals who fit in a specific category is larger by a defined amount in one population than it is in another population, or if it's smaller by a defined amount in one population than it is in another population, or if it's different by a defined amount in one population than it is in another population.

9 | Probability Tree

Length: 11 minutesAuthor: Jason

One more exam-style question before we get to the Binomial section of Chapter 7. This solution requires the use of the probability tree to find the probability distribution of x.

Question #5

Length: 7 minutesAuthor: Jason

While Chapter 8 is characterized as handling individual outcomes of continuous variables, the use of proportions can confuse things. I solve a question here that focuses on both individuals and proportions of populations in order to explain how they work.

Chapter 16 | Study Checklist

Author: Jason

Chapter 16 contains a lot of new information, and is focused on heavily in the upcoming final. Understanding this chapter is crucial for a good mark!