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According to a website about salaries, the national average salary as of October 2003 for a human resources clerk was $29,932. We assume that the annual salaries for clerks are normally distributed
List all samples of size 3, and compute the mean of each sample. (Round your Mean value to 2 decimal places.) Compute the mean of the distribution of sample means and the population mean. (Round your
The following information is collected from students upon exiting the campus bookstore during the first week of classes.
Listed below are the number of years that popes and British Monarchs lived after their election or coronation. Treat the values as a simple random sample from a larger population. Use a .05 signific
The author recorded actual temperatures along with temperatures that were predicted 5 days earlier. Results are listed below. Construct a 99% confidence interval of the mean of the population of "ac
The Labor Bureau wants to estimate, at a 98% confidence level, the proportion of all households that receive welfare. The sample size that would limit the maximum error of estimate to within .07 of
Explain what the slpoe and intersept of the model indiates about cost and carat size.
Suppose the sample size from the normal population is 11. Also assume that the population standard deviation is unknown. What is the value of t for a .05 area in the right tail of this distribution?
State the null and alternative hypotheses for testing whether the mean score (among all students at this university) differs from 0. Calculate the value of the t-test statistic for the hypotheses st
A real estate agent has appointments with eight prospective clients. From past experience the agent knows that the chance of making a sale on any appointment is 10%. What is the probability of the a
For jerseys the mean daily production is 43 pounds with standard deviation of 5 pounds. When shown the state fair, a champion jon and a champion jersey each gave 54 pounds of milk. Which cow milk pr
Low reliability of the variables reduces the correlation coefficient because:
Assume the distribution of heights among all 15 year old boys is normally distributed with mean 67 and standard deviation 3.19. Imagine a basketball team comprised of thirteen 15 year old boys, th
The Public Library has a board of directors consisting of 6 women and 4 men. A 3-member committee from the board is to conduct a search for a new head librarian.
The weekly income of night cashiers at a major department store follows the normal probability distribution. The standard deviation is $45 with a mean of $550.
A manufacturer of light bulbs advertises that, on average, its long-life bulb will last more than 5000 hours. To test the claim, a statistician took a random sample of 100 bulbs and measured the amo
What are the observational units in this study? What is the variable in this study? Calculate the test statistic and p-value.
If the branch of millitary changes the height requirements so that all women are eligable except the shortest 1% and the tallest 2% what are the new height requirements
Assume the readings on thermometers are normally distributed with a mean of 0 degrees celsius and a standard deviation of 1.00 degrees celsius find the probability that a randomly selected thermome
A manufacturer claims that its wood treatment protects outdoor wood fences a mean of 2601 days with a standard deviation of 40.9 days. Assume a normal distribution. In a test of the claim, the woo
(a) What is the probability that you will wait at least 40 minutes? (b) What is the probability that you will wait more than 51 minutes? (c) What is the probability that you will wait at most 57 mi
An insurance company is reviewing its current policy rates. When originally setting the rates they believed that the average claim amount was $1,800. They are concerned that the true mean is actuall
Assume that a quality characteristic is normally distributed. An x-bar control chart is constructed with 3 sigma control limits. A rule to decide that the process is out of control is given by the