00:01
The us center for disease control collects anthropometric, meaning weight, height, etc.
00:07
Data on large samples of us youth, both male and females, and uses these data to create growth charts which essentially characterize the distributions of these measures by age and sex.
00:18
For example, for 18 -year -old males, the mean body weight is 21 .9, and let's go ahead and use that as µ, with a standard deviation of 3 .2.
00:34
Physicians and patients can use these data to figure out how individual bmi values compare relative to the age and sex -specific distribution.
00:43
Suppose you're a physician and you're screening patients at a health fair.
00:47
You may assume the distribution of bmi values for 18 -year -old males is the normal distribution.
00:52
Estimate the range of normal bmi values, i .e.
00:55
The range that contains the middle 95 % of the values in the population of 18 -year -old males.
01:02
So that would be 21 .9 ± 2 · 3 .2, so two standard deviations above and below, which is going to be 15 .5 and 28 .3.
01:17
So that would be option a...