ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern): Questions 34  37 of 246
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Question number: 34
» Statistical Inference and Hypothesis Testing » Characteristics of Good Estimator
Question
Letbe random sample from a population with mean. Then is
Choices
Choice (4)  Response  

a.  Unbiased estimator of 

b.  Biased estimator of 

c.  Unbiased estimator of 

d.  All of the above 

Question number: 35
» Statistical Inference and Hypothesis Testing » Characteristics of Good Estimator
Question
Let be a random sample of size n = 3 from a distribution with mean and variance. If , and . Which one is the best estimator in terms of variance?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  Question does not provide sufficient data or is vague 

Question number: 36
» Statistical Inference and Hypothesis Testing » Characteristics of Good Estimator
Question
Let be a random sample of size n with mean and variance Then which of the following statements is true?
Choices
Choice (4)  Response  

a.  The sample mean and sample variance are unbiased estimators of the mean and variance of the underlying distribution. 

b.  Sample mean is unbiased estimator and sample variance is biased estimator. 

c.  The sample mean and sample variance are biased estimators 

d.  All of the above 

Question number: 37
» Statistical Inference and Hypothesis Testing » Characteristics of Good Estimator
Question
Bias of an estimator can be:
Choices
Choice (4)  Response  

a.  Positive 

b.  Negative 

c.  Zero 

d.  Both a. and b. are correct 
