In: Statistics and Probability
Cholesterol is vital to human health and well being. It plays an
important
role in the structure, fluidity and permeability of the cell
membrane, and helps
synthesize vitamin D and various hormones. Although cholesterol is
essential for
human health, high levels of cholesterol in the blood stream can
lead to damaged
blood vessels and cardiovascular disease. The cholesterol level in
mg/dl of a
group of Canadian adults is assumed to be normally
distributed.
1. Five individuals are randomly selected from this group. Below
are the
measurements of their cholesterol levels:
120 116 130 132 111
Compute a 95% confidence interval for the mean cholesterol
level.
2. Fifteen individuals are randomly selected from this group.
120 116 130 132 111 122 130 111 143 127 129 135 150 121 112.
Compute a 95% confidence interval for the mean cholesterol
level.
3. Based on these two confidence interval constructions, what do
you conclude?
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