A student is concerned with the amount of air pollution students are exposed to in the school’s parking lot after school. The student conducts an investigation to compare the quantity of particulate matter released from the diesel-powered buses, natural gas-powered buses, and the large and small cars as they idle waiting to pick up students. To make measurements, a small piece of white fabric is used to collect particulate matter from the tailpipe of each vehicle as it idles for five minutes. Each piece of fabric is then analyzed to measure the amount of particulate matter it collected. (g) Identify the independent variable in the investigation. (h) Identify one variable that was not mentioned in the description that could affect the results of the investigation. (i) Describe a realistic alternate sampling method to collect particulate matter from the vehicles in the investigation. (j) The student wants to ensure that the results are reliable. Explain how the student could modify the experimental design to make results of the investigation more reliable.
A student is concerned with the amount of air pollution students are exposed to in the school’s parking lot after school. The student conducts an investigation to compare the quantity of particulate matter released from the diesel-powered buses, natural gas-powered buses, and the large and small cars as they idle waiting to pick up students. To make measurements, a small piece of white fabric is used to collect particulate matter from the tailpipe of each vehicle as it idles for five minutes. Each piece of fabric is then analyzed to measure the amount of particulate matter it collected.
(g) Identify the independent variable in the investigation.
(h) Identify one variable that was not mentioned in the description that could affect the results of the investigation.
(i) Describe a realistic alternate sampling method to collect particulate matter from the vehicles in the investigation.
(j) The student wants to ensure that the results are reliable. Explain how the student could modify the experimental design to make results of the investigation more reliable.
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