The Scores of a Certain Population on the Wechsler Intelligence

Multiple Choice

The scores of a certain population on the Wechsler Intelligence Scale for Children IV (WISC IV) are thought to be Normally distributed, with mean μ and standard deviation σ= 15. Bill is a child psychologist who obtains a simple random sample of 25 children from this population; each child is given the WISC IV. The mean of the 25 scores is x̄= 104.32. Based on these data, what is the margin of error for a 95% confidence interval for μ?

A) 1.18
B) 4.94
C) 5.88
D) 6.99