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A shareholders' group, in lodging a protest, claimed that the mean tenure for a chief executive office was at least nine years. A survey of companies reported in the Wall Street Journal found a sample mean tenure time of 7.27 years with a standard deviation of 6.38 years.
a. Formulate hypotheses that can be used to challenge the validity of the claim made by the shareholders group.
b. Assume 85 companies were included in the sample. What is the p value and you conclusion at an alpha level of .01.
Is there evidence to suggest that the training course helps out sales people?
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Find the lowest score on the final exam that would qualify a student for an (A, B, C, D)
Using the first two digits of the measurement as your stem, construct a stem and leaf display of the data above.
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
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Thirty-five percent of the democrats and 70% of the republicans favor the bill. the bill needs a simple majority to pass. using a probability tree, determine the probability that the bill will pass.
What happens to the confidence interval and the power of the test at a particular point of interest. As one increases the sample size of a test, all else remaining the same.
What is the null and alternative hypothesis (in symbols) for this t-test and use the appropriate t-test statistic?
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Smaller clearance (i.e., x1 - x2) than 0.09 should be 0.006, what distance between the nominal dimensions of the two parts (i.e., u1 and u2) should be specified by the designer?
Identify a business research issue, problem, or opportunity facing your organization that can be examined using Hypothesis Testing. Describe the results of a hypothesis test on your selected research issue, problem, or opportunity.
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