Dr. Rasp wonders whether people can tell day-old coffee from used motor oil, in

Question

Dr. Rasp wonders whether people can tell day-old coffee from used motor oil, in a blind taste test. He sets up a table in front of the CUB, and asks passersby to participate. Each subject is given three glasses (two of coffee and one of used motor oil, or vice versa), and asked to identify the glass that is different from the other two. Fifty of the one hundred are correct in their identification.

a) Do these data provide sufficient evidence to believe that people can in fact tell day-old coffee from used motor oil?

b) To what population can you generalize this result?

c) What percentage of time will a member of the population in question be able to make a correct selection in this triangle taste test? (Give a confidence interval.)

d) What percentage of the population in question can actually tell coffee from used motor oil? (Just give a point estimate.)

Explanation / Answer

solution:-

(a) z=3.53 p-value 0 (c) .50 + .092 (d) 25%

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