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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

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Chapter
Section
BuyFindarrow_forward

Essentials of Statistics for the B...

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.

  1. 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.
  2. 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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