Module 3 (pt 3)

Question 1

13. (Read question 13 on page 81)

Answer 1

The study should be neither single-blind nor double-blind.

Question 2

14. (Read question 14 on page 81)

Answer 2

This should be a double-blind experiment

Question 3

15. (Read question 15 on page 81)

Answer 3

This should be a single-blind experiment

Question 4

16. (Read story at the top of page 82) How long is the spring when it is not stretched out at all?

Answer 4

5 inches

Question 5

17. (Read story at the top of page 82) How many pounds are necessary to stretch the spring to 8 inches?

Answer 5

6 pounds

Question 6

18. (Read story at the top of page 82) At about what weight does the spring no longer stretch in response to more weight being put on it?

Answer 6

the spring stops stretching after about 15 pounds

Question 7

19. (Read story at the top of page 82) The student does this experiment on several more springs. Although the actual numbers vary from spring to spring, the graph always has the same basic shape. What does this tell you about the ability of a spring to stretch when pulled?

Answer 7

springs stretch in response to a pull, but there is some maximum strength at which they simply no longer stretch