Data, Sampling, and Variation in Data and Sampling · Exercise 23

Use the following data to answer the next five exercises: Two researchers are gathering data on hours of video games played by school-aged children and young adults. They each randomly sample different groups of 150 students from the same school. They collect the following data.
$$\begin{array}{cccc}\text{Hours Played per Week}& \text{Frequency}& \text{Relative Frequency}& \text{Cumulative Relative Frequency}\\ \text{0–2}& \text{26}& \text{0.17}& \text{0.17}\\ \text{2–4}& \text{30}& \text{0.20}& \text{0.37}\\ \text{4–6}& \text{49}& \text{0.33}& \text{0.70}\\ \text{6–8}& \text{25}& \text{0.17}& \text{0.87}\\ \text{8–10}& \text{12}& \text{0.08}& \text{0.95}\\ \text{10–12}& \text{8}& \text{0.05}& \text{1}\end{array}$$
$$\begin{array}{cccc}\text{Hours Played per Week}& \text{Frequency}& \text{Relative Frequency}& \text{Cumulative Relative Frequency}\\ \text{0–2}& \text{48}& \text{0.32}& \text{0.32}\\ \text{2–4}& \text{51}& \text{0.34}& \text{0.66}\\ \text{4–6}& \text{24}& \text{0.16}& \text{0.82}\\ \text{6–8}& \text{12}& \text{0.08}& \text{0.90}\\ \text{8–10}& \text{11}& \text{0.07}& \text{0.97}\\ \text{10–12}& \text{4}& \text{0.03}& \text{1}\end{array}$$

As part of a way to reward students for participating in the survey, the researchers gave each student a gift card to a video game store. Would this affect the data if students knew about the award before the study?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Statistics 2e · §1.2 Data, Sampling, and Variation in Data and Sampling · Exercise 23