Does drinking orange juice alleviate back pain? 50 volunteers were asked to drin

Question

Does drinking orange juice alleviate back pain? 50 volunteers were asked to drink 3 glasses of orange juice every morning for two weeks. As a result, most volunteers said that pain was lessened enough for them to ask their doctors to reduce their medication.

1. This study is which of the following?

a. a randomized comparative experiment

b. a non-randomized comparative experiment

c. an observational study

2. The explanatory variable in this study is which of the following?

a. drinking OJ

b. amount of back pain

c. volunteers

d. dosage of medication

3. The response variable in this study is which of the following?

a. drinking OJ

b. amount of back pain

c. volunteers

d. dosage of medication

Explanation / Answer

1. This study is an observational study as it studies cause and effect relationship between variables.

Hence part C is correct

2. The explanatory variable in study is

a. Drinking OJ

3. The response variable in the study is

b. the amount of back pain

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