Question

A research team is interested in quantifying how much change has occurred in the percentage of protected marshland in Canada over a ten-year period. They take a simple random sample of Canadian protected lands as of June 30, 2004. For each of the selected lands, they record the percentage of the total geographic area which is marshland. They repeat this process with the same sample of protected lands as of June 30, 2015 for comparison purposes. Which of the following inference procedures would be most appropriate given the research objective? Assume any required conditions will be reasonable.
A) t confidence interval for the difference between means
B) Large sample confidence interval for the proportion
C) t confidence interval for the mean
D) Large sample confidence interval for the difference between proportions

Answer 1

Explanation:

–values for Various Confidence Levels

Confidence Level z*-value

80% 1.28

90% 1.645 (by convention)

95%

Answer 2

Explanation:

B) Large sample confidence interval for the proportion

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