ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern): Questions 146  149 of 246
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Question number: 146
» Statistical Inference and Hypothesis Testing » Minimum Variance Unbiased Estimators
Question
For a normal population , both sample mean and sample median are unbiased and consistent estimators of . In this case, which one will be the efficient estimator?
Choices
Choice (4)  Response  

a.  Sample mean is more efficient estimator of than the sample median. 

b.  Sample median is more efficient estimator of than the sample mean 

c.  Sample mean and Sample median are equally efficient 

d.  All of the above 

Question number: 147
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
A car manufacturing company wants to estimate the mean amount of time a worker takes to assemble the tyres. He considers a sample of 120 workers and calculated mean is 16.2 minutes. Suppose the population standard deviation is 3.6 minutes then 92 % confidence interval is given by:
Choices
Choice (4)  Response  

a. 


b. 


c.  Question does not provide sufficient data or is vague 

d.  None of the above 

Question number: 148
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
It is given that sample mean is 127.3, standard deviation is 19 and sample size is 3534. Then the 95 % confidence Interval is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 149
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
Confidence Interval (CI) is based on
Choices
Choice (4)  Response  

a.  The point estimate or sample mean 

b.  Desired level of confidence 

c.  Standard error of the point estimate 

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