Identify each as a sample survey, observational study, or experiment. Explain how you know and identify any errors, if possible.
a. A study investigated whether boys are quicker at learning video games than girls. Twenty boys and twenty girls that recently bought a new video game were randomly selected. The time it took them to reach a certain level of expertise was recorded.
b. As your statistics'project, you collect data by posting questions on poster board around your classroom and recording how your classmates respond to them.
c. A professional sports team traded its best player. The local television station wanted to find out what the & fans thought of the trade. At the beginning of the evening news program, they asked viewers to call one number if they favored the trade and a different number if they were opposed to the trade. At the end of the news program, they announced that 53.7 % of callers favored the trade.
d. A high school newspaper conducted a survey to determine the quality of the paper among students. The Editor in Chief randomly asked students during lunch breaks in the cafeteria over a span of three days to gather intel.
e. The local department of transportation is responsible for maintaining lane and edge lines on its paved roads. There are two new paint products on the market. Twenty comparable stretches of road are identified. Paint A is randomly assigned to ten of the stretches of roid and paint B to the other ten. The department finds that paint B lasts longer: