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• ## Related Books

 1 answerLast reply by: Luvivia ChangMon Apr 13, 2015 9:39 PMPost by Prachum Chanman on February 16, 2013we are going to reject the null hypothesis when p-values is less than alpha 0 answersPost by abdinasir mohamed on October 4, 2012Are there any stats material for practice?

### Test for a Mean

• If the population is normal and n< 30 or if n≥ 30 from any distribution, use the normal distribution when constructing a test statistic for testing μ when the population standard deviation is known.

• If the population is normal and n< 30, use the t-distribution with ν = n − 1 degrees of freedom when constructing a test statistic for testing μ when the population standard deviation is unknown.

### Test for a Mean

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
• Standard Deviation is Known 0:07
• Central Limit Theory for n>30
• Example 1: Cheese Weight 0:53
• Example 2: Observations 3:53
• Standard Deviation Not Known 6:15
• t-Distribution Usage
• Degrees of Freedom
• Example 3: Height 7:01
• Example 4: Sampling 9:50
• Extra Example 1
• Extra Example 2