See Solution: Testing for Drug Effectiveness. Captopril is a drug - #80185
- Wilcoxon Signed-Ranks Test for Matched Pairs
Testing for Drug Effectiveness. Captopril is a drug designed to lower systolic blood pressure. When subjects were tested with this drug, their systolic blood pressure readings (in mm of mercury) were measured before and after the drug was taken, with the results given (see data set for problem #1). Is there sufficient evidence to support the claim that the drug has an effect? Does Captopril appear to lower systolic blood pressure?
- Wilcoxon Rank-Sum Test for Two Independent Samples.
Testing Red and Brown M&Ms for Identical Populations. Listed below are weights (in grams) of M&M candies (see data set for #2). Use a 0.05 significance level to test the claim that red and brown M&M plain candies have weights with the same distribution. That is, test the claim that the populations of red and brown M&M plain candies are identical.
- Kruskal-Wallis Test (nonparametric analogue of one-way ANOVA)
Laboratory Testing of Flammability of Children’s Sleepwear. Flammability tests were conducted on children’s sleepwear. The Vertical Semirestrained Test was used, in which pieces of fabric were burned under controlled conditions. After the burning stopped, the length of the charred portion was measured and recorded. Results were given (see data set for problem #3) for the same fabric tested at different laboratories. Because the same fabric was used, the different laboratories should have obtained the same results. Did they?
- Rank Correlation
Buying a TV Audience. The New York Post published the annual salaries (in millions) and the number of viewers (in millions), with result given below for Oprah Winfrey, David Letterman, Jay Leno, Kelsey Grammer, Barbara Walters, Dan Rather, James Gandolfini, and Susan Lucci, respectively. Is there a correlation between salary and number of viewers?
5. Runs Test for Randomness
Testing for Randomness of Motor Vehicle Deaths. Refer to the data set for problem #5 for the numbers of motor vehicle deaths in the United States for the preceding two decades. Test for randomness above and below the mean. Do the numbers of motor vehicle deaths appear to be random? If not, is there a trend? Can the trend be explained?
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