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The lifetime of a disk drive head is normally distributed with a population mean of 1000 hours and a standard deviation of 120 hours. Determine the probability that the lifetime for 9 disk drives will exceed 940 hours.
Either no change to the Objective function or a raise in the value of the objective function depends on the constraint.
Jim owns three real estate offices in Anytown. He has decided to open one more office, but cannot decide between hometown or uptown as the towns where he wants to locate.
Based on what we know about statistics and using your example, how do you believe statistics can enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study?
The following table presents data on political party affiliation and class level for sample of students in certain university: If the student is selected at random from sample, determine the probability that student is Republican.
An electric utility wishes to examine the relationship between temperature and electricity use in its service region during the summer months.
Construct the 95% confidence interval for the proportion of students with at least one injury.
Compare a tabular cum sum chart using standardized values h = 5 and k = 1/2. What is the information you learn.
This semester a sample of 55 students revealed an average cost of books of $415 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Critique the HR manager's planned approach and give him advice on how to proceed. You can assume that a reasonable estimate for the proportion of new hires that are happy with the company is .8.
A fast food chain sells its burgers alone or as part of a "value meal" which includes fries and a drink. They know some customers are health conscious.
We want to estimate the delay using the correlation analysis. Determine analytically the autocorrelation ryy(l) in terms of the autocorrelation rxx(l).
By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?Calculate p-value and interpret its meaning.
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