1. Which of the following is/are possible responses to Question 4 of the Four- Question strategy (How could we measure the response of ___ to the change?) ? (One or more ans.)

a. Describe the strength of the electromagnet. b. Measure the distance between the paper clip attracted and the electromagnet.
c. Count the number of thumbtacks repelled.
d. Count the number of paper clips picked up.

2. Which of the following sources of errors will have the LEAST effect on the results of an experiment?

a. Not using quantitative measurements
b. Not having a control setup
c. No repeated trials
d Not keeping other factors constant (other than the MV)

3. Which question in the strategy requires the longest time of brainstorming?

a. Question 1 (What are the avail materials?)
b. Question 2(How do ___ act?)
c. Question 3(What can be my independent variable?)
d. Question 4 (What can be my dependent variable?)​