MATH 251, Probability and Statistics I, Fall 2001, Day 7

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Day 7, Friday Sept.14
Handout on Assessing Normality
Read rest of section 1.3.  Chapter 2 next time.
Hand in: (these are the"backward" problems; bracketed from last assignment page.) 
1.84 (standard normal table) 
  X is normal with mean 3 and s.d. 2. Find: 
     The x for which 30% of the observations are 
               smaller than it. The 30th percentile. 
  1.94 (Wechsler WISC) 
 p. 90 1.95 quartiles etc. 

Normal quantiles: Handout, +
Go through SPSS manual pp. 54-56 (not 57): 
   (The Newcomb data is pre-SPSS'd for you in the Math 251 folder.) 
   Make a normal percentile (Q-Q) plot of the data set you generated 
                 in the manual example 1.13. 
Use SPSS to make histograms and Q-Q plots for
        p. 91 problems 1.102, 1.105, comment. 
                 (for 1.105, Transform>Compute: RV.Uniform (0, 1))		 Read, discuss 
 
 
 
 


Normal quantiles: 
1.97, 98, 99		 Optional 
<--(N(3,2) )Find the x for which 80% of the observations are smaller than it. ( The 80th percentile). 
   >Find answers to normal table problems with SPSS (manual pp. 53-4) 

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