Since were talking about lower cholesterol and the possible side effects of a very low cholesterol.

Since
were talking about lower cholesterol and the possible side effects of a very
low cholesterol level, lets explore the research a bit. According to Goodman
et al. (1988), normal total blood cholesterol levels should be less than 200
mg/dl (SD= 44.4 mg/dl). Levels higher than 240 mg/dl indicate
high cholesterol. Dr. Michael Criqui, writing for the American Heart
Association (1994), says that levels below 160 mg/dl are categorized as
hypocholesterolemia, or abnormally low  levels of cholesterol. Suppose you want
to test this new statin mentioned in question 3(c) to see if it really
»

Since
were talking about lower cholesterol and the possible side effects of a very
low cholesterol level, lets explore the research a bit. According to Goodman
et al. (1988), normal total blood cholesterol levels should be less than 200
mg/dl (SD= 44.4 mg/dl). Levels higher than 240 mg/dl indicate
high cholesterol. Dr. Michael Criqui, writing for the American Heart
Association (1994), says that levels below 160 mg/dl are categorized as
hypocholesterolemia, or abnormally low  levels of cholesterol. Suppose you want
to test this new statin mentioned in question 3(c) to see if it really does
create a decrease in cholesterol. Use the data in Table 9.3 to answer the
following questions.

a.
Calculate X_, _X, X, and _.

b.
Describe the effects of the statin drug on your sample. Do you see any change
in the level of cholesterol after taking the drug?

c.
What is your research question? What are the and alternative hypotheses?
Decide if you want to do a one-tailed or a two-tailed test.

d.
Calculate the value of z. What is your critical z-value?

e.
Sketch a normal distribution, and draw the critical value or values of z.

f.
What is your conclusion?

»

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