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 0 answersPost by Michael W. on July 26, 2010How come z changes to z of alpha divided by 2 here - as compared to the "Standard Deviation Known" lecture where z is of 1 minus alpha divided by 2?

### Estimation of Population Proportion: Large Sample

• The sampling distribution of is approximately normal.

• Since p is unknown and used to find the standard deviation of , use in place of p.

• The confidence interval is

.

### Estimation of Population Proportion: Large Sample

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Population vs Sample Proportion 0:10
• Confidence Intervals for p 1:50
• Example 1: Credit 2:18
• Example 2: Time 4:59
• Sample Size for the Estimation of p 7:31
• Margin of Error
• Conservative Estimate
• Example 3: Gambling 8:40
• Example 4: Clocks 10:53
• Extra Example 1
• Extra Example 2