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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.
Compute the coefficient of determination and interpret its meaning and compute the standard error of estimate, and interpret its meaning.
Based on the genotypes of parents, offspring are expected to have genotypes distributed in such a way that 25% have genotypes denoted by AA, 50% have genotypes denoted by Aa
the manufacturer of a new toothpaste claims that the new product helps whiten teeth. sixty subjects were randomly
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of +0.3?
Define probability and explain the three perspectives. Provide an example of each. Describe the difference between subjective and probabilistic sampling methods. What are the advantages and disadvantages of each?
Choosing the appropriate the sampling design for the given data
A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15.
A farmer in Iowa owns 45 acres of land. He is going to plant each acre with wheat or corn. Each acre planted with wheat yields $200 profit, requires 3 workers, and requires 2 tons of fertilizer; each with corn yields $300 profit, requires 2 worker..
The amounts were normally distributed with a standard deviation of 10 and 12 for men and women, what is the probability that man will spend at most an hour?
The probability that the responder is a woman is 0.57. Find the probability that the response is in favor of the death penalty given that the responder is female.
Calculate the correlation coefficient, coefficient of determination. Check whether there is a relation between correlation coefficient and coefficient of determination.
demonstrate how to calculate area underneath a probability distribution and between two data values of your choice? how
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