每日一题

Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

An online video gaming site with 20 million registered users ages 8 and older wants to find out the average number of hours that all of its registered users spend playing offline video games each week. The site administerwd an online survey to 10 comma 000 of its registered users ages 16 through 18, selected at random. The survey asked the question, "How many hours do you spend playing offline video games each week?" The data collected showed that the mean number of offline gaming hours per user was 8.3 hours per week. What characteristic of the survey prevents these results from being generalized to all of the site's users?

A.The age criteria for selecting the users who were surveyed
B.The size of the sample
C.The method used to analyze the data
D.The size of the population

答案和解析

答案：A

解析：

Option A is correct. The results can be generalized only to the population that was randomly sampled.