ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern): Questions 155  157 of 246
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Question number: 155
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
A school wants to study the number of days the students will be absent from school per year. It surveys attendance of 10 children and the number of days the children is absent from schools are
12  13 
9  11 
7  8 
4  9 
5  8 
Standard deviation Then 99 % Confidence interval on population mean is
Choices
Choice (4)  Response  

a. 


b.  5.64 ≤ μ ≤ 11.56 

c.  Both a. and b. are correct 

d.  None of the above 

Question number: 156
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
A fan manufacturing company needs to know the average amount of time it takes to install a fan. A technique installs it in 64 different houses and the average time of installation is 42 minutes. The calculated standard deviation is 5 minutes. Then 95 % confidence interval foethe mean installation time is
Choices
Choice (4)  Response  

a. 


b. 


c.  42 + 1.225 

d.  Both a. and b. are correct 

Question number: 157
» Statistical Inference and Hypothesis Testing » Minimum Variance Unbiased Estimators
Question
Suppose are the unbiased estimators of with Efficiencies and respectively. and is the correlation coefficient between them. Then
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

