A new study has been published showing that vitamins have no effect on life span

Question

A new study has been published showing that vitamins have no effect on life span. The researchers examined 30 individuals who took vitamins daily since the age of 20 and 30 individuals who never took vitamins. They then measured age at death. What is the biggest problem with their experimental design? (Explain)

There is no control group

There is no independent variable

There is no dependent variable

The sample size is too small

There is no control group

There is no independent variable

There is no dependent variable

The sample size is too small

Explanation / Answer

D) The sample size is too small

30 individuals cannot represent a population its too small a sample for any study. To get significant results the sample size should be large. It should be representing the population, to have any meaning for the study.

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