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A physician employed by a large corporation believes that due to an increase in sedentary life in the past decade, middle-age men have become fatter. In 1995, the corporation measured the percentage of fat in their employees. For the middle-age men, the scores were normally distributed, with a mean of 22%. To test her hypothesis, the physician measures the fat percentage in a random sample of 12 middle-age men currently employed by the corporation. The fat percentages found were as follows: 24, 40, 29, 32, 33, 25, 15, 22, 18, 25, 16, 27. On the basis of these data, can we conclude that middle-age men employed by the corporation have become fatter? Assume a directional H1 is legitimate and use ?= 0.05 (1 tail) in making your decision.
At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
The firm for which you are working is growing. They have announced that they will open facilities in ten states. Calculate the mean, median, mode, variance, and standard deviation for both the sample and the population
Construct a 95% con?dence interval for the difference between the population means and interpret.
For an examination in which grades of 70 and 88 correspond to standard scores of -0.6 and 1.4 respectively. Find:
What amount the investor receives / pays on different days? Explain the outcome of the contract explaining the theoretical concepts of the different steps.
Suppose 7% of construction workers have been exposed to asbestos. We randomly sample 4 construction workers (assume they are independent). Use the Binomial probability function, with n = 4 and p = .07, to find the probability that: Find the probabi..
if the population mean is assumed to be 20 and the sample standard deviation is 5 a score of 15 would have a z-value of
Stat 11 Spring 2011 - Homework 8. I have stated several times in class that although people often focus on the mean, the spread or variation is often as or more important than the mean. Briefly describe how Gladwell's message supports my statement...
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
What kind of sampling design is his staff planning to use?- What difference would you expect the poll to show?-Could the campaign be misled by the poll, concluding that there really is no gender gap? Explain.
The resources use data and statistics to support answers to the same question, but they reach opposite conclusions! The textbook authors use the Gini Index to argue that income inequality is increasing. Perhaps it could be said that statistics are..
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
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