ISS (Statistical Services) Statistics Paper I (New 2016 MCQ Pattern): Questions 431  435 of 472
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Question number: 431
» Statistical Methods » Dispersion
Question
The means of two samples of sizes 50 and 100 respectively are 54.1 and 50.3; the standard deviations are 8 and 7. The standard deviations of the sample of size 150 by combining the two samples will be________.
Choices
Choice (4)  Response  

a.  6.33 

b.  7.56 

c.  8.45 

d.  Question does not provide sufficient data or is vague 

Question number: 432
» Statistical Methods » Curve Fitting and Orthogonal Polynomials
Question
The linear least squares approximation of on using monomial polynomials is . Then the values of and is ________ and ________ respectively.
Choices
Choice (4)  Response  

a.  and 

b.  and 

c.  and 

d.  and 

Question number: 433
» Statistical Methods » Skewness and Kurtosis
Question
Which of the following statement is/are correct regarding Kurtosis of the data?
Choices
Choice (4)  Response  

a.  Positive kurtosis indicates a relatively flat distribution 

b.  Negative kurtosis indicates a relatively peaked distribution 

c.  None of the above 

d.  Question does not provide sufficient data or is vague 

Question number: 434
» Statistical Methods » Dispersion
Question
Which of the following relationship holds between mean deviation (M. D. ) from the mean and the standard deviation (S. D. ) of any discrete distribution?
Choices
Choice (4)  Response  

a.  No relationship exist between S D and M D 

b.  S D M D 

c.  S D M D 

d.  S D M D = 1 (always) 

Question number: 435
» Statistical Methods » Skewness and Kurtosis
Question
Which of the following statement is/are correct?
Choices
Choice (4)  Response  

a.  A distribution that is more peaked than normal is called platykurtic. 

b.  A distribution identical to the normal distribution is called mesokurtic. 

c.  A distribution that is less peaked than normal is called leptokurtic. 

d.  All of the above 
