What type of thinking is unbiased?

What part of the scientific method is usually an "if / then" statement, or a prediction that can be tested?

If a null hypothesis is refuted (proven false), it indicates that ...

A controlled experiment should have how many groups?

An experiment is performed to see the effects of fertilizers on pond water. Two similar sized ponds are located. The scientist adds a liter of water soluble fertilizer to pond A once a week for six weeks. Nothing is added to pond B. At the end of the six weeks, the turbidity of the water in both ponds is measured as an indicator of algal growth.

What is the independent variable?

An experiment is performed to see the effects of fertilizers on pond water. Two similar sized ponds are located. The scientist adds a liter of water soluble fertilizer to pond A once a week for six weeks. Nothing is added to pond B. At the end of the six weeks, the turbidity of the water in both ponds is measured as an indicator of algal growth.

What is the control?

An experiment is performed to see the effects of fertilizers on pond water. Two similar sized ponds are located. The scientist adds a liter of water soluble fertilizer to pond A once a week for six weeks. Nothing is added to pond B. At the end of the six weeks, the turbidity of the water in both ponds is measured as an indicator of algal growth.

What is the dependent variable?

What is the name of the changing part of an experiment that is intentionally manipulated by the scientist?

What is the name of the part of an experiment that responds to the change in the independent variable?

What system of measurement is typically used in science?

As of the most recent data, the current level of carbon dioxide in the atmosphere is around 421 parts per million (ppm), which is considered a record high level.

What type of data is "421 parts per million"?

Which of these may be untested, or have the least amount of evidence?