Confidence Intervals

a. Calculate confidence intervals for the world average of an individual using the

Internet (% of population).

b. Discuss whether and why any assumptions are required or not to calculate these

confidence intervals.

c. Suppose the world standard deviation of individual using the Internet (% of

population) is known. Discuss the possible impact on the confidence interval results

(Note: The answer should not be supported by calculation, but should display

conceptual understanding)

? State if confidence interval increases, decreases or remains unchanged

? Explain why it increased / decreased / or remained unchanged.

? Discuss whether the confidence interval results will be more accurate, less

accurate or the same.

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