1.)The scores on the Wechsler Adult Intelligence Scale are approximately Normal with μ = 100 and σ = 15. What is the shortest interval that covers 95% of WISC scores is closest to?
1.)The scores on the Wechsler Adult Intelligence Scale are approximately Normal with μ = 100 and σ = 15. What is the shortest interval that covers 95% of WISC scores is closest to?
2.) The scores on the Wechsler Adult Intelligence Scale are approximately Normal with μ = 100 and σ = 15. Find the 2nd Quintile of WISC score distribution is about
3.)Osteoporosis is a condition in which the bones become brittle due to loss of minerals. To diagnose osteoporosis, an elaborate apparatus measures bone mineral density (BMD). BMD is usually reported in standardized form. The standardization is based on a population of healthy young adults. The World Health Organization (WHO) criterion for osteoporosis is a BMD 2.5 STANDARD DEVIATIONs below the mean for healthy young adults. BMD measurements in a population of people similar in age and sex roughly follow a
Women aged 70-79, of course, not young adults. The mean BMD in this age is about -2 on the standard scale for young adults. Suppose the standard deviation is the same as for young adults. What percent of this older population have osteoporosis?
4.) Pearson and Lee obtained the following results in a study of about 400 families:
Average Height of Husband = 68 inches & SD of Husband Height = 3.0 inches
Average Height of Wife = 64 inches & SD of Wife Height = 3.0 inches
Predict the height of a husband when the height of his wife is 62 inches.
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