Read the following SAT test question and thenclick on a button to select your answer.
In a recent study to determine how often people indifferent parts of the United States check theweather, a random sample of residents in New England and a random sample of residents onthe West Coast were surveyed. The study found over 90% of people surveyed in New Englandchecked the weather daily, while 70% of people surveyed on the West Coast did so. If themargin of error of both samples were the same, which of the following statements is bestsupported by the study's findings?
A.People in New England check the weather more often because the climate is colder than onthe West Coast.
B.People in New England check the weather more often because there is more weathercoverage on television than there is on the West Coast.
C.There is evidence that people in New England check the weather more often than people onthe West Coast.
D.There is evidence that people in New England check the weather on their smartphones morethan do people on the West Coast.
Choice C is correct. A sample survey is a study thatobtains data from a subset of a population, usuallythrough a questionnaire or interview, in order toestimate population attributes.
Since the margin of error is the same for each sample, the only reasonable conclusion basedon the data from the observational study is that there is evidence (although not a guarantee) that people in New England check the weather more often than people do on the West Coast.