7. Recall the chapter example which described the fact that the mean IQ in large

Question

7. Recall the chapter example which described the fact that the mean IQ in large, diverse populations is 100 and the standard deviation is 15. Your sample of 300 members of your community gave you a mean IQ score of 108. Calculate the upper and lower limits of your confidence interval that you would fill into the following statement: "We can be confident that the mean IQ score in our community lies between and Which of the following figures comes closest to your answer? A. 106 and 110 B. 99 and 101 C. 98 and 102 D. 85 and 115 E. None of the above lawing?

Explanation / Answer

Required confidence interval (usually 95%)

= (xbar  ± Z critical * / n)

= (108 ± 1.96 * 15 /300)

= ( 106, 110)

option A is correct

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