If the Estimated Population Standard Deviation Based on Previous Studies

question 37

Multiple Choice

If the estimated population standard deviation based on previous studies is 20 percent, the acceptable error is plus or minus 5 percent, and the z-value for a 95 percent level of confidence is 1.96, the needed sample size is approximately:

• A) 48.
• B) 210.
• C) 61.
• D) 153.
• E) 196.

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