Consider the following to answer the question(s) below:
EU (European Union) countries report that 46% of their labour force is female. The United Nations wants to determine if the percentage of females in the Canadian labour force is the same. Representatives from Statistics Canada plan to check a random sample of over 10,000 employment records on file to estimate the percentage of females in the Canadian labour force.
-If Statistics Canada wishes to tighten its interval, they should
A) increase the confidence level
B) increase the sample size
C) decrease the sample size
D) both A and B
E) both A and C

Question

Quizplus · Accepted Answer

To tighten the interval, the sample size needs to be increased. Increasing the confidence level may also slightly widen the interval, therefore, choosing both A and B (D) or both A and C (E) would not be the best choice.

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