From the information provided below propose the independent variable (IV) and the dependent variable (DV) you might use to test the claim.

Identify the type of measurement scale used (nominal [N], ordinal [O], interval [I], or ratio [R] with your proposed DV. (12 pts.)

Claim	Variables
A researcher would like to evaluate the claim that large doses of vitamin C can help prevent the common cold. One group of participants is given a large dose of the vitamin (500 mg per day), and a second group is given a placebo (sugar pill). The researcher records the number of colds each individual experiences during the 3-momth winter season.
Researchers found that people rated cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown to from)
In an experiment examining the effects of humor on memory, two researchers showed participants a list of sentences, half of which were humorous and half of which were nonhumorous. The participants consistently recalled more humorous sentences than nonhumorous sentences.