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Question: 1. If the cholesterol levels of adults are normally distributed with mean 230 and standard deviation 25, what is the probability that a randomly sampled adult has a cholesterol level greater than 260?
2. Explain in what sense the population variance is sensitive to small changes in a distribution.
Use a statistical computer package to verify the rank-sum and the Z-statistic obtained in Exercise 20. Is the p-value the same? (Does the statistical package use a continuity correction?)
The Rutter Nursery Company packages pine bark in 50-pond bags. From a long history, the packaging department reports that the distribution is normal. At the end of each day Jeff Rutter
What is the probability that a randomly selected male is either a "Rationalist" or a "Teacher"?- What is the probability that a randomly selected female is not a "Teacher"?
Hard water II. The data set from England and Wales also notes for each town whether it was south or north of Derby. Here are some summary statistics.
What is the probability that sheer guesswork yields betwenn 25 to 30 correct answers for the test (assume the student has no knowledge of the problems). Be sure to justify why you can use the method you do.
Determine the sample size necessary to estimate a population mean to within 1 with a 90% confidence given that the population standard deviation is 10.
X is a normally distributed random variable with mean 10 and variance 24.
items produced by a manufacturing process are supposed to weigh 90 grams. the manufacturing process however is such
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
a researcher is interested in finding out if college-bound high school students tend to smoke cigarettes less than high
What were its strengths and weaknesses? What would you change and why? What did you learn about teaching from your mentor teacher? Include this reflection with your unit plan.
The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
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