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(Solved): A crossover study was conducted to investigate whether oat bran cereal helps to lower cholesterol i ...



A crossover study was conducted to investigate whether oat bran cereal helps to lower cholesterol in hypercholesterolemic males. Ten such individuals were randomly placed on a diet that included either oat bran or corn lakes; 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 are shown below:

a) Are the two samples of data paired or independent?

b) what are the appropriate null and alternative hypothese for a two sided test?

c) conduct p-value test at the 0.05 level of significance.

d) conduct the critical value test at the 0.05 level of significance.

e) what do you conclude?

student submitted image, transcription available below
\begin{tabular}{|l|l|l|} \hline & LDL & LDL \\ \hline Subject & Corn Flakes & Oat Bran \\ \hline 1 & 4.61 & 3.84 \\ \hline 2 & 6.42 & 5.57 \\ \hline 3 & 5.40 & 5.85 \\ \hline 4 & 4.54 & 4.80 \\ \hline 5 & 3.98 & 3.68 \\ \hline 6 & 3.82 & 2.96 \\ \hline 7 & 5.01 & 4.41 \\ \hline 8 & 4.34 & 3.72 \\ \hline 9 & 3.80 & 3.49 \\ \hline 10 & 4.56 & 3.84 \\ \hline \end{tabular}


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