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The employees of a firm that does asbestos cleanup are being tested for indications of asbestos in their lungs. The firm is asked to send four employees who have positive indications of asbestos on to a medical center for further testing. If 40% of the employees have positive indications of asbestos in their lungs, find the probability that six employees who do not have asbestos in their lungs must be tested before finding the four who do have asbestos in their lungs.
Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average
Is it reasonable to conclude that the mean weekly salary of school teachers is lower at a .05 level of significance? Why?
An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000.
what is the probability that ms. a mr. b and mrs. c win the rst second and third prizes respectively in a drawing if
A company's employees are working to create a new energy bar. They would like the two key ingredients to be peanut butter and oats, and they want to make sure they have enough carbohydrates and protein in the bar to supply the athlete.
A survey researcher compares 4 religious groups on their attitudes toward education. 1200 subjects receive the survey and 823 respond. There are 10 items; the likert scale is 1-5. A high positive score indicates a more positive attitude.
A group of items of data have been found to be normally distributed with a mean of 80 and a standard deviation of 6. Please convert 80 to a z-score and show the calculation.
Health Outcome of Interest
The data returned could be categorized as follows: participants--designers and non-designers, and males and females; emotions categorized by valence--6 positive and 6 negative; typeface stimuli categories--weight (bold or light), classification (seri..
a decision maker is interested in estimating a population proportion. a sample of size n 150 yields 115 successes.
Estimate the relative risk of neurological impairment for children exposed to secondary smoking, and calculate a 95% con?dence interval for this risk.
Find the P-value that would be used to determine if the percentage of customers who prefer mint chocolate chip ice has increased at a 5% level of significance.
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