Wiki Page, Math 13 - Perez Sandbox : Module 22 - Introduction

Wiki Page
2026-01-17T21:15:37-08:00

This is the beginning of Unit 9. Unit 9 includes Modules 22-25. Unit 9 concludes with the Unit 9 Checkpoint at the end of Module 25.

In this unit we learn to make inferences about population means, so we working with quantitative variables now, instead of categorical variables.

Here are the types of research questions we will engage. Questions in bold-face are relevant to Unit 9.

Types of research questions

Type of Question | Examples | Variable Type | Unit
Make an estimate about the population | What proportion of all U.S. adults support the death penalty? | Categorical variable | Inference for One Proportion
What is the average number of hours that community college students work each week? | Quantitative variable | Inference for Means
Test a claim about the population | Do the majority of community college students qualify for federal student loans? | Categorical variable | Inference for One Proportion
Has the average birth weight in a town decreased from 3,500 grams? | Quantitative variable | Inference for Means
Compare two populations | When we compare teenage girls to teenage boys, is there a difference in the proportion with depression? | Categorical variable | Chi-Square
In community colleges do female students have a higher average GPA than male students? | Quantitative variable | Inference for Means

Here again is the Big Picture. We have highlighted ideas new to this module in purple.

Text description of the Big Picture of Statistics Step 4: Inference for Population Means

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