This Science quiz is called 'Range' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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In mathematics, the range of data is defined as the difference between the lowest number (minimum) and the highest number (maximum) in the data set and is useful when applied to the data obtained from repeating an experiment. The smaller the range of the repeats, the higher the precision of the experiment and the more reliable the data. Top grade candidates in science will be using mathematics to analyze their results. They could use the range to help their arguments for or against the reliability of their experiment.
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Take for example these two sets of data obtained by different groups of students carrying out the same experiment:
Team A: 12, 12, 10.5, 10, 12, 10, 12.5
Team B: 14, 11.5, 12, 9, 12, 10.5, 10
Each team of students carried out the experiment 7 times and by pure chance, both sets of results give the same mean value. The range of the data of team A is 2 (their maximum value is 12.5 and their minimum 10.5) but the range for team B is 5 (their maximum value is 14 and their minimum 9) so you can say that the results of team A are more precise. If the two teams were to carry out the same experiment once more, team A would be more likely to be closer to the mean value.
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