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The following data was collected in a clinical trial evaluating a new medication designed to improve wound healing in trauma patients. The new compound is compared against a placebo. After treatment for 10 days with the new compound or placebo the extent of wound healing is measured and the data are shown below.
Percent Wound Healing
Treatment 0-25% 26-50% 51-75% 76-100%
New psoriasis medication (n=125) 14 38 33 40
Placebo (n=125) 36 43 35 11
Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance.
How much gas? Joan is concerned about the amount of energy she uses to heat her home. The graph below plots the mean number of cubic feet of gas per day.
A True-False test was developed for a Risk Management class. A student, who didn't study, decided to randomly guess the answer on each question.
Suppose you were presented with the following summary of study results comparing a vegetarian diet to a meat diet.
An advertisement for NordicTrack, an exercise machine that simulates crosscountry skiing, claimed that "in just 12 weeks, research shows that people.
Find the probability that the percent of 18 to 34-year-olds who check Facebook before getting out of bed in the morning is at least 30.
the distribution of iowa test vocabulary scores for seventh grade students in gary indiana is approximately normal with
The percentiles, quartiles, and deciles for a continuous random variable can be approximated from a relative cumulative frequency
People who answered incorrectly, 26 are men. The question was given to an equal number of men and women all with the same IQ. Find the probability that among 120 wrong answers, at least 82 made by men.
c. Find the z-score corresponding to a sample mean of 66 inches for a sample of 25 females.
Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 8 IQ points of the true mean.
Calculate a Pearson's r to determine the type and strength of the relationship between caffeine and stress level. How much of the variability in stress score is accounted for by the number of cups of coffee consumed per day?
In a CNN/Time poll conducted December 17-18, 1998, a sample of n = 1031 adults in the United States was asked, "Do you think the police should.
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