Low-density lipoprotein (LDL) is sometimes called the "good cholesterol" because high values are associated with a reduced risk of heart disease. According to the American Heart Association, people over the age of 20 years should have at least 40 milligrams per deciliter (mg/dl) of LDL cholesterol. A sample of 33 U.S. women aged 20 and over have a mean LDL of 55 mg/dl with a standard deviation of 15.5 mg/dl. Assume that the distribution is normal. Show your work for each item below...
