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A study of the pay of corporate CEOs (chief executive officers) examined the cash compensation, adjusted for inflation, of the CEOs of 104 corporations over the period 1977 to 1988. Among the data are the average annual pay increases for each of the 104 CEOs. The mean percent increase in pay was 6.9%. The data showed great variation, with a standard deviation of 17.4%. The distribution was strongly skewed to the right.
1) Despite the skewness of the distribution, there were no extreme outliers. Explain why we can use t procedures for these data.
2) What are the degrees of freedom?
3) Give a 99% confidence interval for the mean increase in pay for all corporate CEOs.
A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. a) Provide a 95% confidence level for all the patients who are referred to the health center by the hospital.
You are the designer for your company's web site. You have data to indicate that the mean download time for the homepage is 5.8 seconds and that the standard deviation of download time is 2.1 seconds.
SOB's systolic blood pressure is a random variable with a mean of 145 mmHG and a standard deviation of 20mmHG. If the SOB's blood pressure is taken at a randomly chosen moment
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Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
Test hypothesis that mean weight of 2 sheets are equal against alternative that they are not(suppose equal variances). Use α=0.05 and suppose equal variances. Determine the P value.
Which of the following is true about the expected value of perfect information. It is the amount you would pay for any sample study.
What are the endpoints of a 95 percent confidence interval for the proportion defective. (Round your answers to 3 decimal places).
A survey was conducted to measure height off men. In survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 69.2 inches and a standard deviation of 2.0 inches.
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population.
Assume the arrival of these emails i3 approximated by the Poisson distribution.
Determine the 90% confidence interval for average days worked by employees in all payroll departments?
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