Question

A) Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory. To test this claim, a researcher selects a sample of twenty five college students. Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test. The standardized memory test scores are normally distributed with a mean of 70 and a standard deviation of 15. The sample of twenty five students demonstrated a mean score of 75 with a standard deviation of 35. For this study, what is the independent variable?

Group of answer choices

Twenty five students

Ginkgo biloba supplement

Mean of 75 and standard deviation of 15

Standardized memory test

B) A researcher randomly draws a group of participants. She has each participant complete a questionnaire measuring depression. She then has participants watch an episode of the "Little Rascals" (Comedy sitcom). The researcher again has each participant complete a questionnaire measuring depression, hypothesizing a decrease in the measured depression as a result of her treatment. For this study, what is the dependent variable?

Group of answer choices

Depression

Participants

Questionnaire

"Little Rascals"

Answer 1

A)

Here we have to check the claim that Ginkgo biloba supplement enhance human memory, that is human memory is dependent on that supplement.

So memory score is dependent on supplement. Therefore Ginkgo biloba supplement is independent variable.

B) Here she measures depression at normal situation and after watching "Little rascles".

So depression is dependent on diffrent situation or treatment. Therefore, Depression is dependent variable.