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# MATH 1401: Elementary Statistics (TI Calculator and Free Websites)

## Looking Back

Module 3 Summary

In this module, you learned about how statistics can help you make educated decisions about common questions. The shift from descriptive statistics to inferential statistics can be tough to grasp but can lead to a better understanding of everyday data.

What to know

To understand the material in this module, you should know the following material:

• Z-interval and the importance of the population standard deviation
• T-interval and the importance of a population standard deviation not being present
• The different levels of confidence and what a confidence interval tells you about the sample data.
• The different scenarios for hypotheses testing based on the null and alternative hypothesis.
• Z-test and the importance of the population standard deviation
• T-test and the importance of a population standard deviation not being present
• Most importantly, knowing when to use the correct method based on what the question is asking.
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