What features of the story on milk chocolate and heart health described in question 11 should cause you to consider the results less convincing? a. The study was sponsored by a large milk chocolate manufacturer; b. A total of 10 rats were used in the study; c. The only difference between the rats was that human participants of the experimental group received chocolate along with their regular diets, and the human participants of the control group received no additional food; d. The reporter notes that other studies indicate milk chocolate does not have a beneficial effect on heart health; e. all of the above

Video transcript

Hello everyone here we have a question that asked upon conducting the research on exam type preference among the students which of the phone will create a bias on the results of the study. A choosing the introvert students over the extrovert ones. Be random selection of students in the school, see following the scientific methods of research or d creating a hypothesis prior to the conduct of data gathering. So a bias of the result as the study would be something that would change the results of the study. So choosing the introvert students over the extrovert ones would change the result of the study because the introvert ones might prefer written exams over oral ones instead of the extrovert ones maybe preferring oral ones. So our answer here is a choosing the introvert students over the extrovert ones. And this can be avoided by random selection of students in school. If this selection is random we shouldn't get that bias. Thank you for watching. Bye.