50, or 1 / 2, as does the probability of a girl being born. (b) How might this poll have been improved?Ĩ.14 The probability of a boy being born equals.
(a) Comment on whether or not this was a random sample.
#Microsoft word equation proportion tv#
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. Following a televised debate between Barack Obama and Mitt Romney in the 2012 U.S. (a) Would the median BMI score exceed, equal, or be exceeded by the mean BMI score of 28?Ĩ.10 Television stations sometimes solicit feedback volunteered by viewers about a televised event. Assume that the positively skewed distribution of BMIs for adult American males has a mean of 28 with a standard deviation of 4. It is well-established that Americans have become heavier during the last half century. 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. (d) the middle 95 percent? ĥ.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) the upper 2 percent, that is, 2 percent to the right (and 98 percent to the left)? What proportion of IQ scores areĥ.13 IQ scores on the WAIS test approximate a normal curve with a mean of 100 and a standard deviation of 15.
Chapter 8, numbers 8.10, 8.14, 8.16, 8.19, and 8.21ĥ.11 Scores on the Wechsler Adult Intelligence Scale (WAIS) approximate a normal curve with a mean of 100 and a standard deviation of 15.
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