2. Hypothesis: "changing the thermostat setting upon or down will cause the room
temperature to change the same way." This hypothesis is:
A. Null hypothesis
D. All of the above
B. Alternative hypothesis
E. None of the above
C. A and B
3. The independent variable in the above hypothesis is (look at question 2):
A. the room temperature
B. the changing thermostat setting
C. The effects of the thermostat change
D. A and B
E. B and C
4. A research question "Does adding nitrogen fertilizer increase plant growth? The
hypothesis will be:
A. The addition of nitrogen fertilizer had no impact on the growth of the plant
B. The nitrogen fertilizer will affect the growth of the plant
C. The plant growth affects the nitrogen fertilizer
D. A and B
E. B and C
5. Smith thinks that a special juice will increase the productivity of workers. He creates
two groups of 50 workers each and assigns each group the same task (in this case, they are
supposed to staple a set of papers). Group A is given the special juice to drink while they work.
Group B is not given the special juice. After an hour, Smith counts how many stacks of papers
each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
i) Which group is a control group?
A. Group A
B. Group B
B. Group B
ii) Which group is an experimental group?
A. Group A
iii) Which hypothesis is rejected from Smith's experiment?
A. Special juice increase the productivity of the workers
B. There is no cause and effect relationship between special juice consumption
and productivity
iv) What will be the conclusion of the Smith's experiment?
A. There is a cause and effect relationship between special juice drinking and
productivity
B. There is no cause and effect relationship between special juice drinking and
productivity
v) What is the independent variable of the experiment?
A. Productivity
juice
D. A and B
B. stapling set of papers
E. B and C
C. drinking special
vi) What is the dependent variable of the experiment?
A. The number of stacks of papers stapled by the workers
B. The alertness of the workers
C. The sweetness of the juice
D. The number of juice cup consumed by workers
E. All of the above
6. Which one of the following statements is TRUE about hypothesis?
A. it is a proposal to be tested by experiment
B. it is a statement that show the relation between dependent and independent variables
C. it is useful to make predictions
D. All of the above
E. None of the above
7. Control group of an experiment unlike the experimental group:
A. the variable is left unaltered
B. used to compare the results of the treatment
C. subjects do not receive the treatment
D. All of the above
E. None of the above
8. Theory implies:
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