Q4A2 take it from Sunday Feb 3rd at 6:00 PM to Tuesday Feb 5th at 7:00 AM
Review of Attempt 1
Started on:
Monday, 4 February 2008, 09:24 PM
Completed on:
Monday, 4 February 2008, 10:24 PM
Time taken:
59 mins 54 secs
Raw score:
7.05/10 (71%)
Grade:
7.05 out of a maximum of 10
(1204)
1
Marks: 1
What is a practical application of the Central Limit Theorem?
Choose one answer.
a. It gives you the message that you should pick as large of a sample as you can afford
b. It relates to the normal distribution and the concept of Z and percentile
c. It allows you to make inference about the population mean and percentage
d. It shows you the meaning of standard deviation over repeated samples
Correct
Marks for this submission: 1/1.
(1708)
2
Marks: 1
We have discussed that the standard deviation of the distribution of sample percentages or
SE(p hat) is calculated by taking the square root of
p hat * (1  p hat)/ N , where p hat is the proportion in the sample and N is sample size
What does SE(p hat) show?
Choose one answer.
a. It shows the variation for p hat values for repeated samples from the population.
b. It shows the standard error of the mean across repeated samples from the population.
c. It shows the standard deviation of p hat for repeated samples from the population.
d. It shows the distribution of p hat for the single sample that the researcher draws from
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Correct
Marks for this submission: 1/1.
(2261)
3
Marks: 1
Two researchers want to estimate the average age at which females get married in a certain
country.
Researcher A chooses a random sample of 100 women and finds the 95% confidence interval
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 Spring '08
 Esfandini
 Normal Distribution, Standard Deviation, researcher, Correct Marks

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