Practise using categorical bar charts to justify only the claims supported by displayed proportions, while separating percentage comparisons from unknown counts.
Based on the bar chart, which of the following statements must be true?
Less than half of the students in the 10th grade indicated that they regularly rode the bus to school.
At least 20\% of students from each grade level indicated that they regularly rode the bus to school.
The number of students from the 9th grade who indicated that they regularly rode the bus to school is greater than the number of students from the 10th grade who indicated that they regularly rode the bus to school.
The 12th graders had the least number of students who indicated that they regularly rode the bus to school.
The 9th graders had the greatest percentage of students who indicated that they regularly rode the bus to school. A study of the effect of note-taking on student learning used two groups, each consisting of 100 biology students. - Group 1: On day one of the study, these 100 students were given an hour-long class on how to take notes in outline form. - Group 2: On day one of the study, these 100 students were not given any training on note-taking. On day two of the study, both groups were placed in a classroom and were taught a lesson on biology. After the lesson, the students were given an hour to review their notes and then took an assessment on the content of the lesson. The students in Group 1 performed significantly better on the assessment than the students in Group 2 did.
E