Problem
A researcher interested in Springfield citizens' shopping habits surveys a randomly selected group of 200 Walmart shoppers. $76 \%$ of those surveyed indicated that price was more important to them than where an item was produced. The researcher concluded that "about three quarters of the people in Springfield are more concerned with cost than where an item is made." This conclusion might be invalid because: the size of the sample is too small. $76 \%$ is not exactly three quarters. the sample is not representative of the population. there was no control group. None of the above
Solution
Step 1 ：The researcher's conclusion might be invalid due to the sample not being representative of the entire population of Springfield.
Step 2 ：The survey was only conducted among Walmart shoppers, who may not represent the overall demographic of Springfield.
Step 3 ：Walmart shoppers might be more price-conscious than the average citizen in Springfield, which could lead to a bias in the results.
Step 4 ：Therefore, the conclusion that 'about three quarters of the people in Springfield are more concerned with cost than where an item is made' may not be accurate.
