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A clinical trial was conducted to test the effectiveness of the drug zipiclone for treating insomnia in older subjects. Before treatment with zipiclone, 16 subjects had a mean wake up time of 102.8 min. After treatment with zoplicone, the 16 subjects had a mean wake up time of 98.9 min and a standard deviation of 42.3 min (based on data from cognitive behavioral therapy vs Zopiclone for treatment of chronic primary insomnia in older adults by Siversten et al., journal of the American medical association, vol 295, no 24). Assume that the 16 sample values appear to be from a normally distributed population and construct a 98% confidence interval estimate of the mean wake time for a poplulation with Zopiclone treatments. What does the result suggest about the mean wake time of 102.8 min before the treatment? Does Zopiclone appear to be effective?
a random sample of stat200 weekly study times in hours is as follows 4nbspnbsp 14nbspnbsp 15nbspnbsp 17nbspnbsp 20a.
suppose that the times people spend being served at a post office window are approximately normal with mean 1.5
The number of weeds that remain living after a specific chemical has been applied averages 1.3 per square yard and follows a Poisson distribution. Based on this, what is the probability that a 3 square yard section will contain less than 4 weeds?
estimating the sample standard deviation using normal score.for a sample with a mean of m 85 a score of x 90
A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance level, can we conclude that a larger proportion of students at your school have jobs?
what is the probability two individuals chosen at random from a classroom of 30 students are both females if there are
suppose the mean systolic blood pressure in a group of individuals is 150 mmhg with a standard deviation of 15.
The average height of a particular plant is known to be 78 cms. The average height of 20 plants to which a particular manure was applied was found to be 85 cms.
the national center for education statistics reported that mean number of instructional computers per public school
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
Delta Airlines quotes a flight time of 2 hrs, 5 minutes for its flights from Cincinnati to Tampa. We belive that actual flight times are uniformly distriubted between 2 hours and 2 hours 20 minutes.
What are examples in which non-parametric tests are used to analyze business related problems in general, and more specifically, problems related to marketing?
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