12/8/13 4:49 PM
Solid fats are more likely to raise blood cholesterol levels than liquid fats. Suppose a nutritionist analyzed
the percentage of saturated fat for a sample of 6 brands of stick margarine (solid fat) and for a sample of 6
brands of liquid margarine and obtained the following results:
We want to determine if there a significant difference in the average amount of saturated fat in solid and
liquid fats. What is the test statistic? (assume the population data is normally distributed)
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Your answer is CORRECT.
It has been observed that some persons who suffer renal failure, again suffer renal failure within one year
of the first episode. This is due, in part, to damage from the first episode. The performance of a new drug
designed to prevent a second episode is to be tested for its effectiveness in preventing a second episode.
In order to do this two groups of people suffering a first episode are selected. There are 45 people in the
first group and this group will be administered the new drug. There are 75 people in the second group and
this group will be administered a placebo. After one year, 12% of the first group has a second episode and
14% of the second group has a second episode. Conduct a hypothesis test to determine, at the significance