Question 1
The Director of Food Operations at a small college campus wants to determine student concerns about cafeteria food. Select the sample most likely to evidence bias.
◦ A randomly selected group of 30 students leaving the dining hall after a Friday dinner
◦ A randomly selected group of 30 registered students
◦ A randomly selected group of 30 students who have signed food contracts
◦ A randomly selected group of 30 students entering the dining hall before dinner
Question 2
A researcher wants to determine the relative merits of oak and maple as firewood. Which process is most likely to bias the results of the study?
◦ Comparisons by 5 friends, none of whom have a wood burning fireplace, of the fires of fifteen pieces of each type of wood obtained from friends with woodpiles
◦ Personal judgement of the fires of 15 pieces of each type of wood picked up from the floor of a hardwood forest
◦ Comparison of the reports of wood burners on the internet
◦ The judgments of the quality of a wood fire by 30 friends, half of whom burn only oak, half of whom burn only maple
The pH scale and the relative acidities of common substances
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