CS 270  Computer Stat. Techniques                  Quiz #1
Walpole, Myers & Myers [1998]                      Spring 1998
Chapters 1 & 2


Name:__________________________

Please, provide answers with all steps, formulas, and reasoning so
that liberal partial credit may be applied. No short answers such as a  
single number will be accepted. Where needed explain everything in detail.
All problems should be in sorted, numerical order.  All are of equal credit. 
Best wishes and best of prospects.



1. Compute the mean for the following numbers (show all formulas/steps):
   23, 97, 14, 54, 61, 85, 10, 37, 69 



2. Compute the median of the numbers in problem #1 (above).



3. Compute the variance of the battery lifetimes in Walpole, page 9, 
   problem 1.



4. Compute the standard deviation for problem 3 (above). 



5. Case study: What happens to the tensile strength of cloth specimens as 
   we increase the cotton content from 15%, to 20%, to 25% and finally to
   30%?  Hint: Feel free to use scatter-plot models. 



6. Walpole, page 18, problem 10b (fishing sample spaces & events).



7. Walpole, page 26, problem 10 (product rule/tree diagrams).



8. Walpole, page 34, problem 16b (combinations of Dom's Pizza). 



9. Walpole, page 43, problem 18 (independence & life expectancy).



10. Walpole, page 48, problem 8. (Bayes' Rule)   
    Hint: Let L = Latex user, S = semigloss, R = roller, C = can. 
    Show all steps and formulas.



All problems should be in sorted order.  
Thank you for completing the quiz & after the remaining lecture,
have a good spring-break.