Question

experiment four: krusty the clown was told that a certain itching powder was the newest best thing on the market; it even claims to cause 50% longer lasting itches. interested in this product, he buys the itching powder and compares it to his usual product. one test subject (a) is sprinkled with the original itching powder, and another test subject (b) is sprinkled with the experimental itching powder. subject a reported having itches for 30 minutes, subject b reported having itches for 10 hours.

1. what was the hypothesis?
2. describe how the experimental group was different from the control group:

experimental group:

1. name the factors that must be kept constant throughout the experiment (regardless of what group they are in)

1)
2)
3)

1. explain how the results support the claim.
2. could this experiment have been improved to increase accuracy? explain your answer.

Explanation:

1. The hypothesis is likely the claim about the new itching - powder causing 50% longer - lasting itches.
2. The control group (Subject A) was sprinkled with the original itching powder, while the experimental group (Subject B) was sprinkled with the new experimental itching powder.
3. Factors to keep constant could include the amount of powder used, the skin type of the subjects, the environmental conditions (temperature, humidity).
4. The claim was that the new powder causes 50% longer - lasting itches. Subject A had itches for 30 minutes and Subject B for 10 hours (600 minutes), which is much more than 50% longer than 30 minutes, thus supporting the claim.
5. The experiment could be improved by using a larger sample size of subjects to account for individual differences, and by conducting multiple trials to ensure consistency of results.

Answer:

1. The new itching powder causes 50% longer - lasting itches.
2. Control group: Sprinkled with original itching powder. Experimental group: Sprinkled with experimental itching powder.
3. 1) Amount of powder used. 2) Skin type of subjects. 3) Environmental conditions.
4. Subject B had itches for much more than 50% longer than Subject A, supporting the claim.
5. Yes, by using a larger sample size and conducting multiple trials.