A survey of 800 people who “binge-watch” were asked how many episodes is too many to watch in one viewing session. The results are displayed in the bar chart. How is the bar chart misleading?

They should have used a pie chart instead of a bar graph.

The y-axis scale is not the same between each notch.

It does not show the different categories of binge-watching.

It does not provide the total number of people surveyed.

A study of 68,946 French volunteers found that the respondents who ate the most organic food had a smaller risk of developing cancer than the other respondents. Furthermore, the difference was determined to be statistically significant. Is it reasonable to say that eating more organic food will decrease the risk of developing cancer, based on the study of French volunteers?

No, because there could be confounding variables

No, because cause and effect requires the study to be an experiment

Yes, because the study found a statistically significant difference

Yes, because the sample size was large

Identify the independent and dependent variables for each study. People who walk at least 3 miles a day are randomly selected, and their blood triglyceride levels are measured to determine if the number of miles that they walk has an influence on these levels.

Independent: number of miles walked

Independent: triglyceride levels

Dependent: number of miles walked

Identify the independent and dependent variables for each study. Employees of a business were placed into two groups. One group were required to work a 9am to 5pm schedule. The other group was permitted a more flexible 8 hour schedule. All of the employees were interviewed about job satisfaction.

Independent: work schedule group

Mr. Chen wants to know if student-made outlines improve performance on algebra tests. He prepares two review assignments for his students. One assignment just gives a list of exercises from the textbook. The other requires students to make an outline of the ideas that the test covers and then gives the same list of exercises. Each of the 28 students then took the same 50-minute test, which Mr. Chen graded himself. Identify the population.

Mr. Chen's class of 28 Algebra students

Mr. Chen wants to know if student-made outlines improve performance on algebra tests. He prepares two review assignments for his students. One assignment just gives a list of exercises from the textbook. The other requires students to make an outline of the ideas that the test covers and then gives the same list of exercises. Each of the 28 students then took the same 50-minute test, which Mr. Chen graded himself. Identify the sample.

Mr. Chen's class of 28 Algebra students

Mr. Chen wants to know if student-made outlines improve performance on algebra tests. He prepares two review assignments for his students. One assignment just gives a list of exercises from the textbook. The other requires students to make an outline of the ideas that the test covers and then gives the same list of exercises. Each of the 28 students then took the same 50-minute test, which Mr. Chen graded himself. Explain why Mr. Chen would assign the outline randomly.

To eliminate any chances of variability

To prevent friends from copying

Mr. Chen wants to know if student-made outlines improve performance on algebra tests. He prepares two review assignments for his students. One assignment just gives a list of exercises from the textbook. The other requires students to make an outline of the ideas that the test covers and then gives the same list of exercises. Each of the 28 students then took the same 50-minute test, which Mr. Chen graded himself. Explain why Mr. Chen included a group that didn't prepare an outline.

To compare the results between a treatment group and a control group

To prevent friends from copying

To decrease the amount of grading he needs to do

Mr. Chen wants to know if student-made outlines improve performance on algebra tests. He prepares two review assignments for his students. One assignment just gives a list of exercises from the textbook. The other requires students to make an outline of the ideas that the test covers and then gives the same list of exercises. Each of the 28 students then took the same 50-minute test, which Mr. Chen graded himself. Identify two variables that Mr. Chen kept the same during the experiment.

Both groups did the review exercises

Both groups took the same 50-minute test