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Administrative staff based at a business school in the UK are advised to take a 15 minute break from their personal computer after working on it for 90 minutes continuously. A random sample of 36 staff revealed that, one average a break was taken after 97.4 minutes of continuous use. The corresponding standard deviation was measured at 5.1 minutes.
a. Provide a 99% confidence interval for the population mean time for working on a PC continuously, prior to taking a break.
b. Conduct a suitable test at the 1% level of significance, to see whether staff, on average, are working longer than advised.
Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal probability distribution, with a mean of $1,280 and a standard deviati..
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page
For each of the given population would the score of X=50 be considered central score (near middle of distribution) or extreme score (far out in the tail of the distribution )?
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
The shelf and purchases it, and he later discovers that the lamp he purchased is defective. What is the probability that the defect came with the first shipment?
What are the steps of the order of operations? Why is it important that you follow the steps rather than solve the problem from left to right?
Given the hypothesis Ho: u=400, you conduct a sample of 12 observations and obtain a sample mean of 407 and a sample standard deviation of 6. Using a .01 significance level to test to see if you would reject Ho, what would be the value of your cri..
To findout the point estimate of the difference among population mean. Elucidate the percentage increase in the number of days on the disabled list.
Is this a proper probability density function? How do you know? Find the mean, variance, and standard deviation of x, showing your work.
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02. However, a later showing of the same movie, a sample of 25 purchases where the mean was $5.12 with a standard deviation of $2.14.
Carry out an overall test to determine if there is significant evidence of a difference among A; B and C, at the significance level 1%.
Given the recursively defined sequence a_1= 0, a_2= -30, and a_n=8a_n-1 -15a_n-2, use complete induction to prove that a_n=5*3^n - 3*5^n for all positive integers n.
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