Using the frequencies procedure (ANALYZE, DESCRIPTIVE STATISTICS, FREQUENCIES), request a histogram of the number of brothers and sisters (SIBS) from the General Social Survey with the normal curve overlay (from the Charts button), as well as the mean and standard deviation (from the Statistics button).
a. Comment on the closeness of the actual distribution to the normal curve.
b. Based on the normal distribution (using the z score and Table A), what is the probability that a person has 6 or more siblings?
c. Compare the probability from the normal distribution that you just calculated in part b to the proportion of the actual scores of persons who have 6 or more siblings.