3. George and Michelle each claimed to have the better recipe for chocolate chip cookies. They decided to conduct a study to determine whose cookies were really better. They each baked a batch of cookies using their own recipe. George asked a random sample of his friends to takes his cookies and to complete a questionnaire on their quality. Michelle asked a random sample of her friends to complete the same questionnaire for her cookies. They then compared the results. Which of the statements about this study is false?
Because George and Michelle have a different population of friends, their sampling procedure makes it difficult to compare the recipes.
A local school board plans to conduct a survey of parents’ opinions about year-round schooling in elementary schools. The school board obtains a list of all families in the district with at least one child in an elementary school and sends the survey to a random sample of 500 of the families. The survey question is provided below.
A proposal has been submitted that would require students in elementary schools to attend school on a year-round basis. Do you support this proposal? (Yes or No) The school board received responses from 98 of the families, with 76 of the responses indicating support for year-round schools. Based on this outcome, the local school board concludes that most of the families with at least one child in elementary school prefer year-round schooling.
What is a possible consequence of nonresponse bias for interpreting the results of this survey?
Someone advised the local school board to take an additional random sample of 500 families and use the combined results to make their decision. Would this be a suitable solution to the issue raised in part (a)? Explain.
Suggest a different follow-up step from the one suggested in part (b) that the local school board could take to address the issue raised in part (a).