ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 466  467 of 471
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Question number: 466
» Statistical Methods » NonParametric Tests » Median
Question
Which of the following statements is incorrect for calculation of median for Individual series?
Statement 1: If the number of observations is odd then median is the observation in the arranged order
Statement 2: If the number of observations is even then the median is the mean of and observations in the arranged order.
Choices
Choice (4)  Response  

a.  Statement 1 and 2 is correct 

b.  Only Statement 2 is correct 

c.  Statement 1 and 2 is incorrect 

d.  Only Statement 1 is correct 

Question number: 467
» Statistical Methods » NonParametric Tests » MannWhitney
Question
A physician is interested in the effect of an anesthetic on reaction times. Two groups are compared, one with (A) and one without (B) taking the anesthetic. Subjects had to react on a simple visual stimulus. Reaction times are not normally distributed in this experiment, so data is analyzed with the MannWhitney UTest for ordinal scaled measurements. The table below shows the rankordered data:
Mean RT  Rank  Group 
131  1  B 
135  2  A 
138  3.5  B 
138  3.5  B 
139  5  A 
141  6  B 
142  8  B 
142  8  A 
142  8  B 
143  10  B 
144  11  A 
145  12  B 
156  13  B 
158  14  A 
165  15  A 
167  16  B 
171  17  A 
178  18  A 
191  19  B 
230  20  B 
244  21  A 
245  22  A 
256  23  A 
267  24  A 
268  25  A 
289  26  A 
The Correct conclusion is
Choices
Choice (4)  Response  

a. 


b.  The anesthetic group shows significantly slower reaction times than the nonanesthetic group 

c.  The observed value is greater than the Zvalue 

d.  All a. , b. and c. are correct 
