Project #85145 - median, mode, range and varience

I simple need these two questions answered.  It doesn’t need to me long, just a clear explanation and I will post them to my class discussion wall.  This is not an essay.  An explaination for both. Thank you much. 

 

1.)   1.)    Given the following students' test scores (95, 92, 90, 90, 83, 83, 83, 74, 60, and 50), identify the mean, median, mode, range, variance, and standard deviation for the sample. In what situations would all of this information be useful?

 

 

  

 

2.)   Explain the purpose of a null hypothesis. Why are both a research/alternative hypothesis and a null hypothesis necessary in statistics?

Subject Science
Due By (Pacific Time) 10/13/2015 12:00 am
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