Chapter 1, Problem 9P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Two researchers are both interested in determining whether large doses of vitamin C can help prevent the common cold. Each obtains a sample of *n =* 20 college students.

**a.**The first researcher interviews each student to determine whether they routinely take a vitamin C supplement. The researcher then records the number of colds each individual gets during the winter. Is this an experimental or a nonexperimental study? Explain your answer.**b.**The second researcher separates the students into two roughly equivalent groups. The students in one group are given a daily multivitamin containing a large amount of vitamin C, and the other group gets a multivitamin with no vitamin C. The researcher then records the number of colds each individual gets during the winter. Is this an experimental or a nonexperimental study? Explain your answer.

**(a)**

To determine

**To identify:** The type of study.

Explanation

**Given info:**

The researcher interviews student to identify the level of vitamin C.

**Justification:**

*Non-experimental studies:*

Non-experimental studies also examine relationships between variables by comparing groups of scores...

**(b)**

To determine

**To Find:** The type of study.

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