[R] test question, variance

[Phil Spector]

Contact your instructor, and let them know that you are 
having problems with an assignment.  Most instructors have
office hours, where you can discuss problems like this.

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Fri, 5 Mar 2010, SquareAce wrote:

>
> Can someone get me going in the right direction with this test question? We
> have went as far as t.test in our class, but not to power or anova yet. I
> have pasted the question and a summary of the dataset "gpa".
>
> 5. Given that all the GPA data in this dataset is comprised of means, would
> you expect the underlying dataset of students’ individual GPA to be more
> variable or less variable than this dataset as measured by the variance?
> Explain. (5 points)
>
> here is the summary of gpa:
>> summary(gpa)
>       school        GPA        gender classification semester 
> Business :32   Min.   :2.200   f:80   fresh :40      fa04:40 
> Education:32   1st Qu.:2.590   m:80   junior:40      fa05:40 
> Liberal  :32   Median :2.790          senior:40      sp05:40 
> Nursing  :32   Mean   :2.775          soph  :40      su05:40 
> Sciences :32   3rd Qu.:2.922
>                Max.   :3.640 
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