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Question: Analysis of variance has long been used in providing evidence of the effectiveness of pharmaceutical drugs. Such evidence is required before the Food and Drug Administration (FDA) will allow a drug to be marketed. In a recent test of the effectiveness of a new sleeping pill, three groups of 25 patients each were given the following treatments. The first group was given the drug, the second group was given a placebo, and the third group was given no treatment at all. The number of minutes it took each person to fall asleep was recorded. The results are as follows.
Use a computer (or hand calculations) to determine whether the drug is effective. What about the placebo? Give differences in average effectiveness, if any exist.
Baseball: Home Run Percentage The home run percentage is the number of home runs per 100 times at bat. A random sample of 43 professional baseball players gave the following data for home run percentages (Reference: The Baseball Encyclopedia, Macm..
Sketch density curves that might explain distributions with fallowing shapes: symmetric, but with two peaks( i.e., two strong clusters of observations)
the reading speed of second grade students in large city is approximately normal with a mean on 90 words per minute and
Verify that the margin of error is about 1.1% for a 95% confidence interval for the percentage that suffers from severe allergies in the population represented by this sample.
an inspector correctly identifies defective products 90 of the time. for the next 10 products what is the probability
Customers arrive into a queue, where they are served, and then depart. We model the time between two successive arrivals by an exponential distribution with an arrival rate l=9.
You've been recently hired as a marketing analyst in an advertising agency. You are assigned the task of assessing the impact of direct marketing promotions.
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
You are tracking the sales of three tires. Using the binomial distribution formula, what is the probability that at least one will need a repair?
What is the probability of failing math only (that is, you fail math but pass history)?
Studies of ‘‘intellectually gifted'' children have generally defined the lower limit of their IQ scores at 140; approximately 1% of the population have IQ scores above this limit. Find the standard deviation of this distribution.
two students from a certain university are randomly selected from all other students who attend that university. the
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