• ##### Device
• TI-Nspire™ CX
• TI-Nspire™ CX CAS
• TI-Nspire™ Navigator™
• TI-Nspire™
• TI-Nspire™ CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

• ##### TI-Nspire Version

3.0

Statistics: Confidence Levels for Means
by Texas Instruments - Action Consequence
TI-Nspire Navigator Lesson

Published on October 26, 2011

#### Objectives

• Students will interpret a confidence level as the degree of confidence in the process used to produce an interval that will contain the true mean of the population.
• Students will recognize that as the confidence level increases, on average the confidence interval increases in width. (CCSS Mathematical Practices)
• Students will reason abstractly and quantitatively (CCSS Mathematical Practices)

#### Vocabulary

• confidence interval
• confidence level
• population parameter

This lesson involves generating a confidence interval for the mean of a population from a random sample of size n and considering how certain one can be that this interval would contain the actual population mean.
As a result, students will:

• Experiment with different confidence levels and finally investigate the relationship between confidence levels and sample size.
• Use the actual population mean to check their estimates and to develop an understanding of the meaning of confidence level.