Ivo Dinov UCLA Statistics, Neurology, LONI, Math/PIC 

STAT
35 Winter 2006 
Interactive and Computational
Probability 
Department
of Statistics 
Instructor: Ivo Dinov 
Homework 1 
Due Date:
Wednesday, Jan. 25, 2006 
Class interval for the clearness index 
Number of days 
Relative Frequency 
Cumulative Relative Frequency 
Model Probabilities (model used) ___________ 
0.16  0.20 
3 

0.21  0.25 
5 

0.26  0.30 
6 

0.31  0.35 
8 

0.36  0.40 
12 

0.41  0.45 
16 

0.46  0.50 
24 

0.51  0.55 
39 

0.56  0.60 
51 

0.61  0.65 
106 

0.66  0.70 
84 

0.71  0.75 
11 
389 
356 
359 
363 
375 
424 
325 
394 
402 
373 
373 
370 
364 
366 
364 
325 
339 
393 
392 
369 
374 
359 
356 
403 
334 
397 
 How different are the sample mean and median?
 By how much should the largest time be increased so that the sample median is half the sample mean?
14.5  25.6  52.4  66.3  69.3  69.8  76.2 
 What is the fivenumber summary for this data?
 Calculate the following sample measures of spread: variance, standard deviation and the meanabsolutedeviation.
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