ISEE Word Problems Question 231: Answer and Explanation
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Question: 231
11. Sayani is trying to determine the mean number of texts students at her school send. Which sets of data will give her the least reliable information about the texting habits of students in her school?
- A. A report showing the total number of students with phones in her school and the total number of texts sent by those phones
- B. A survey of all the students in the school asking how many texts they send daily over the course of a month
- C. A report showing the total number of texts sent by a random sample of students at the school
- D. The most popular brand of phone owned by students in the school
Correct Answer: D
Explanation:
The answer is D
Sayani wants to calculate the mean number of texts sent by students. Three of the choices provide data sets to help her determine this number, but the question asks for the one that is least reliable. The most popular phone will not tell Sayani how many texts anyone sends. On the other hand, the mean can be calculated with the total number of texts and the total number of students with phones, either by a report or by students' own admission (choices (A) and (B)). The mean can be projected with a random sample of the population (choice (C)).