Solutions Statistics

A crossover study was conducted to investigate whether oat bran cereal helps to lower serum cholest

Question: A crossover study was conducted to investigate whether oat bran cereal helps to lower
serum cholesterol levels in hypercholesterolemic males. Twenty three such individuals
were randomly placed on a diet that included either oat bran or com flakes: after two
weeks, their low-density lipoprotein (LDL) cholesterol levels were recorded. Each man
was then switched to the alternative diet. After a second two-week period, the LDL
cholesterol level of each individual was again recorded. The data from this study is given the following table.

	N	Mean	Std
Com	23	\[{{\bar{X}}_{com}}\] = 4.4	\[{{s}_{com}}\] = 0.624281	spooled = 0.683313
Oat	23	\[{{\bar{X}}_{Oat}}\]= 3.86	\[{{s}_{Oat}}\] = 0.742345
Diff	23	\[{{\bar{X}}_{Diff}}\]= .54	\[{{s}_{diff}}\]= 1.028502