If the estimated population standard deviation based on previous studies is $20, and the acceptable error is plus or minus $5, 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)62
D)153
E)196

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The Answer of If the estimated population standard deviation based on previous studies is $20, and the acceptable error is plus or minus $5, 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)62
D)153
E)196

If the Estimated Population Standard Deviation Based on Previous Studies