Mean Waist Size If a researcher wanted to know the mean waist size (see Exercise 77 for the definition of mean) of men in the United States, the waist size of every man would have to be measured and then the mean waist size calculated. Instead, researchers find a representative sample of men and find the mean waist size of the sample. Because the entire population of men is not used, there is a possibility that the calculated mean waist size is not the true mean waist size. For one study, researchers used the formula , where m is the true mean waist size, in inches, of all men to be 95% sure of the range of values for the true mean waist size. Using this inequality, what is the range of mean waist sizes of men in the United States? Round to the nearest tenth of an inch. (Source: Based on data from the National Center for Health Statistics)

Growth True growth Increase in weight due to protein and bone deposition and fat deposition which is part of the developmental process Does not include excess fat deposition Don't know Why growth starts How it is regulated Why it stops DNA is ultimate regulator Cell size and number are regulated to reach genetically determined value Growth occurs in 2 ways Hyperplasia Increase in cell numbers Occurs before birth Some exceptions Some adipose cells continue to divide and get new cells for a while after birth Skin Slough cells Repair wounds Intestinal lining