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 dependent variable in the investigation.
(h) Identify the hypothesis of the investigation.
(i) Describe a possible control group for this investigation.

Answer and Explanation:

The dependent variable is the amount of particulate matter emitted by each type of car. Dependent variable is one that needs to be influenced by the independent variable to happen. The types of cars are the main influencers of the particulate particles to which the research refers, which means that these particles only exist with the influence of these cars, making them dependable.

The research hypothesis is "Students are exposed to high levels of pollution in the school parking lot." A hypothesis is an assumption made by the researcher of the research. This assumption must be answered by the experiment carried out and it is related to the researcher's questions in relation to the researched subject.

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