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Dr. Richmond, a psychologist, is studying the daytime television viewing habits of college students.
She believes 45 percent of college students watch soap operates during the afternoon.
To further investigate, she selects a sample of 10.
a. Develop a probability distribution for the number of students in the sample who watch soap operas.
b. Find the mean and the standard deviation of this distribution.
c. What is the probability of finding exactly four watch soap operas?
d. What is the probability less than half of the students selected watch soap operas?
For the 20 test scores shown, find the percentile rank for a score of 86.
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The area under a normal curve is always equal to 1, no matter what the mean and standard deviation are.
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If p denotes the p -value of the corresponding hypothesis test, which of the following is true?
To give 98% confidence interval for population mean μ, you would use critical value.
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
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Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
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