## Nursing Assignment: Wechsler Adult Intelligence Scale

Nursing Assignment: Wechsler Adult Intelligence Scale

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**how all relevant work; use the equation editor in Microsoft Word when necessary.**

**Chapter 5, numbers 5.11, 5.13, 5.15, and 5.18****Chapter 8, numbers 8.10, 8.14, 8.16, 8.19, and 8.21**

**Finding Proportions **

**5.11 Scores on the Wechsler Adult Intelligence Scale (WAIS) approximate a normal curve with a mean of 100 and a standard deviation of 15. What proportion of IQ scores are**

a) above Kristen’s 125?

(b) below 82?

(c) within 9 points of the mean?

(d) more than 40 points from the mean?

**Finding Scores **

**5.13 IQ scores on the WAIS test approximate a normal curve with a mean of 100 and a standard deviation of 15. What IQ score is identiﬁed with **

(a) the upper 2 percent, that is, 2 percent to the right (and 98 percent to the left)?

(b) the lower 10 percent?

(c) the upper 60 percent?

(d) the middle 95 percent? [Remember, the middle 95 percent straddles the line perpendicular to the mean (or the 50th percentile), with half of 95 percent, or 47.5 percent, above this line and the remaining 47.5 percent below this line.]

(e) the middle 99 percent?

**5.18 The body mass index (BMI) measures body size in people by dividing weight (in pounds) by the square of height (in inches) and then multiplying by a factor of 703. A BMI less than 18.5 is deﬁned as underweight; between 18.5 to 24.9 is normal; between 25 and 29.9 is overweight; and 30 or more is obese. It is well-established that Americans have become heavier during the last half century. Assume that the positively skewed distribution of BMIs for adult American males has a mean of 28 with a standard deviation of 4. **

(a) Would the median BMI score exceed, equal, or be exceeded by the mean BMI score of 28?

(b) What z score deﬁnes overweight?

(c) What z score deﬁnes obese?

**8.10 Television stations sometimes solicit feedback volunteered by viewers about a televised event. Following a televised debate between Barack Obama and Mitt Romney in the 2012 U.S. presidential election campaign, a TV station conducted a telephone poll to determine the “winner.” Callers were given two phone numbers, one for Obama and the other for Romney, to register their opinions automatically. **

(a) Comment on whether or not this was a random sample.

(b) How might this poll have been improved?

**8.14 The probability of a boy being born equals .50, or 1 / 2 , as does the probability of a girl being born. For a randomly selected family with two children, what’s the probability of **

(a) two boys, that is, a boy and a boy? (Reminder: Before using either the addition or multiplication rule, satisfy yourself that the various events are either mutually exclusive or independent, respectively.)

(b) two girls?

(c) either two boys or two girls?

**8.16 A traditional test for extra-sensory perception (ESP) involves a set of playing cards, each of which shows a different symbol (circle, square, cross, star, or wavy lines). If C represents a correct guess and I an incorrect guess, what is the probability of**

(a) C?

(b) CI (in that order) for two guesses?

(c) CCC for three guesses?