Question 1. Scientists form _______ hypothesis to answer questions.

accurate

short

mathematical

testable

Question 2. Scientists _______ experiments to make sure the results are meaningful.

perform

repeat

conclude

communicate

Question 3. A good hypothesis

is always true.

is always a guess.

is not simply a guess.

none of the above

Question 4. Two essential parts of a good experiment are

the control group and a single variable.

the control group and the outcome.

two variables.

two control groups.

Question 5. In an experiment, the experimental treatment differs from the control treatment only in the _______ being studied.

experiment

variable

hypothesis

data

Question 6. A sample size should be ________ enough to give an accurate estimate for the whole population.

large

small

strong

heavy

Question 7. A group of individuals or events that have been selected to represent a population is known as a

team.

species.

family.

sample.

Question 8. Models used by scientists include

conceptual models.

variable models.

physical models.

both a and c.

Question 9.A conceptual model represents a way of thinking about

relationships.

variables.

data.

positions.

Question 10. To fully understand a complex environmental issue, we really need to consider

economics.

values.

scientific information.

all of the above