Statistical Inference and Hypothesis TestingConfidence Interval Estimation (ISS (Statistical Services) Statistics Paper II (New 2016 MCQ Pattern)): Questions 18  20 of 73
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Question number: 18
» Statistical Inference and Hypothesis Testing » Confidence Interval Estimation
Question
The Government conducts national survey to study about the home gardening.
A random sample of 250 households is taken which have vegetable gardens. The average size of their gardens is 643 square feet. The calculated standard deviation is σ = 247 square feet. How can you interpret the result at 90 % for confidence interval?
Choices
Choice (4)  Response  

a.  Probability that mean size of household vegetable gardens lies in the interval 617.31 and 668.69 is 0.90 

b.  617.31 and 668.69 are 90 percent confidence limits 

c.  The length of the confidence interval is 51.38 

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

Question number: 19
» 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: 20
» 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. 

