Question

1. experimental design classwork

identify the independent variable (the thing that krusty changes)
krusty was told that a certain itching powder was the new best powder 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) was sprinkled with the experimental itching powder. subject a reported having itches for 30 minutes. subject b reported to have itches for 45 minutes.

Explanation:

The independent variable is what the experimenter manipulates. Here, Krusty changes the type of itching powder (original vs. experimental) used on the test subjects. So the independent variable is the type of itching powder (original itching powder or experimental itching powder).

Answer:

The Independent Variable is the type of itching powder (original itching powder or experimental itching powder).