PSAT Math Multiple-Choice Practice Question 753

Question: 753

Assume that a scientist is able to measure the average weight of lobsters within a 50-mile radius of an island with a confidence level of 90% by collecting data from 100 random spots around the island. If he wishes to increase the confidence level in his results to 95%, what would best help him achieve his goal?

Correct Answer: C

Explanation:

(C) The best way to increase a confidence level is to increase the amount of relevant sample data. A more accurate scale could be of minor help but not as much as increasing the overall data samples. Choices (A) and (B) would provide irrelevant and less accurate data, respectively.

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