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A personnel manager for a large corporation feels that there may be a relationship between absenteeism and age and would like to use the age of a worker to develop a model to predict the number of days absent during a calendar year. A random sample of 10 workers was selected with the results presented below:
Age Days Absent
27 15
61 6
37 10
23 17
46 9
58 7
28 13
36 11
64 5
40 7
What is the correlation coefficient?
Carry out the test for the variance of girls score is not significantly less than the given data.
Which of the following statements isn't a property of the normal probability distribution? Please explain briefly why
Estimate a test statistic for null hypothesis H0: μ = 30 against two-sided alternative hypothesis H1 : μ ≠ 30, and by plotting this on its reference distribution.
A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05). What is the value of the sample mean?
Using the original data, estimate the population standard deviation with 90% probability.
Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively.
Describe a business situation that you have had or might face that will benefit from the use of confidence intervals?
Find a 99% confidence interval for the population mean number of weekly miles.
The width of a confidence interval will be:
The men took an average of 20.5 hours per year of personal time with a standard deviation of 2.75 hours. What is the pooled estimate of the variance? Round to three decimal places.
When using the normal distribution (empirical rule) to obtain the bounds for a 99.73 percent of the values in a population, the interval generall will be _________________ the interval obtained for the same percentage if Chebyshev's theorem is ass..
What is the probability that the police will strike and the firefighters will not? What is the probability that the firefighters will strike and the police will not?
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