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# Chapter 6:

Lesson 20: Confidence Intervals for the Mean When S Is Known and Sample Size

Lesson 21: Confidence Intervals for the Mean When S Is Unknown

Lesson 22: Confidence Intervals for Variances and Standard Deviations

Lesson 23: Confidence Intervals and Sample Size for Proportions

We don't just build hopes, we build future.

We don't just build hopes, we build future.

Lesson 20: Confidence Intervals for the Mean When S Is Known and Sample Size

Lesson 21: Confidence Intervals for the Mean When S Is Unknown

Lesson 22: Confidence Intervals for Variances and Standard Deviations

Lesson 23: Confidence Intervals and Sample Size for Proportions