Which of the Following Statements Is NOT a Valid Rule

question 3

Multiple Choice

Which of the following statements is NOT a valid rule for determining sample size?

• A) Sample sizes larger than 30 and less than 500 are appropriate for most research.
• B) Sample sizes smaller than 30 and larger than 500 are inappropriate for most research.
• C) Sample size should be about 10 times larger than the number of variables measured in a study.
• D) With tight controls, experimental research can be successful with samples as small as 10.