Sample Questions The pothos is a hardy tropical plant well-adapted to household conditions. With good care, the mean lifespan of a pothos is = 25 years with standard deviation = 3 years. Under my care (and the careful attention of my cats) I have a
Analysis of Variance
Allows us to test the difference in means for more than two groups.
Tedious to do multiple t-tests Increase your alpha error, even if you think you are keeping it at .05 (or whatever level you initially choose)
Use the F stat
A little more about Independent Samples t-tests
You know that one of the assumptions of an independent samples t-test is that the variances of the samples are equal.
We didn't specifically test this assumption when we learned about it, but we can.
Confidence Intervals
Allows a statement of confidence about the estimate of the population parameter.
The mean score for high school students on an achievement exam is 475 with = 10 . You randomly sample 10 students from CPS and obtain a mean of
Dependent Samples t-test
The two samples you are comparing have some relationship to each other.
Pre- and post-treatment measures Matched pairs
How to test?
First, you should recognize that the unit of observation is the pair of results.
Each i
Homework 9 14 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 8 14 points
You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 7
14 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 6
11 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 5 16 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 4
13 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 3
15 points total You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats t
Homework 2
23 points You can use SPSS or the calculation tool on IntroStats to obtain any information (mean, SD, etc.) you may need. However, please attach any output you obtain from SPSS or write down any values you calculate from IntroStats to get
Homework 1 19 points total Problems from Howell: Ch 8: 12, 16, 18 (1 point each) Problems from Williams (Introstats.net): Ch 4: 14; Ch 5: 7, 10, 13; Ch 6: 7 (2 points each) Dr. Smith thinks that listening to Barry Manilow music while studying will af