In which of the following situations does the rule for sample proportions apply?
A)A pollster takes a random sample of 1,000 Americans and asks their opinion on the President (approve/disapprove/neutral).He is interested in the percentage who approve of the President.
B)You want to know whether or not people like the new CD by your favorite artist.You ask 5 people and record the percentage who say they like it.
C)A researcher weighs the same newborn baby each week for one year, and records whether or not the child is within the normal weight range.At the end of the year, he records the percentage of times that the child was within the normal weight range.
D)All of the above.

Question

Quizplus · Accepted Answer

The rule for sample proportions applies in situations where we are interested in the percentage or proportion of a certain characteristic in a population, based on a random sample. Option A fits this description, while options B and C involve very small samples, which may not be representative of the entire population.

In Which of the Following Situations Does the Rule for Sample