Ease Into Prep with an SAT^® Question of the Day

To make a reliable inference from a survey, the survey sample needs to be unbiased, relatively large, and a good representation of the population in question. Here, the population in question is parents of children of high school age. Not everyone with a mobile phone is a parent of at least one child of high school age. For example, single and married people who don't have children are likely to make up at least a portion of the random texts sent out by the polling company. This means that, despite being large and randomly selected, the sample is unlikely to be a good representative sample. Choice (D) is correct.