Read each of the following experimental setups and identify the independent (experimental) and dependent (responding) variables. For each experiment, create a possible hypothesis.
A new chemical is tested to see if it reduces the number of sea lice surviving on farmed fish compared to the chemical usually used.
Independent variable
Dependent variable
Possible hypothesis
Increasing levels of carbon dioxide in the atmosphere is correlated with global warming. An experiment is run to see what effect increased carbon dioxide levels will have on plant growth.
Independent variable
Dependent variable
Possible hypothesis
A new study has been started to see if taking non-steroidal anti-inflammatories such as ibuprofen, will reduce the incidence of ovarian cancer in women at high risk of ovarian cancer.
Independent variable
Dependent variable
Possible hypothesis
A study is done to see if fruit set is greater in areas where mason bee colonies have been established compared to areas without mason bees.
Examine the following questions and identify those which would be good scientific questions.1. Which type of fertilizer produces taller plants?2. Are biology students better looking than average? 3. Which extraction method reduces caffeine in coffee most effectively?
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