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?