Statistical Inference and Hypothesis TestingConfidence Interval Estimation (ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern)): Questions 21  24 of 73
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Question number: 21
» 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 

Question number: 22
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
In a college survey, children were asked how many hours they study per day. A sample of 22 children is collected. The mean was 3.25 hours with a standard deviation of 1.57 hours. Then 95 % confidence interval for the number of hours of study per day is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 23
» 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: 24
» 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 
