Statistical Inference and Hypothesis TestingConfidence Interval Estimation (ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern)): Questions 24  26 of 73
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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 

Question number: 25
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
The Indian Government wants the information of children per family. It takes a random sample of 40 families and the numbers of children in the selected families are
1  2  1  2 
1  1  1  1 
5  4  3  4 
1  0  1  2 
1  0  3  0 
0  0  2  2 
5  3  1  0 
8  1  0  1 
2  1  1  5 
2  1  2  3 
Calculated standard deviation is σ = 1.95. Obtain the 90 % confidence interval for the mean number of children per family in India
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 26
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
The health organization wants to study the mean weight of Indian women of the age group 30  40. A sample of forty woman of that age group is randomly selected and their weights in pounds are recorded.
140  153  167  115 
136  136  145  125 
147  134  154  148 
136  126  139  132 
152  132  139  120 
130  138  138  146 
116  137  143  115 
159  147  122  145 
128  123  134  127 
131  154  150  116 
The calculated standard deviation is σ = 12.77. Then the 99 % confidence interval for the mean weight is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

