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Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 100 minutes and a standard deviation of 15 minutes. What proportion of 1040R tax forms will be completed in more than 114 minutes? Round your answer to at least four decimal places.
Construct a 95 percent confidence interval for the true mean.
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 65%.
Recognize the midpoint of the first class. Recognize the class boundaries of the first class.
What is the total expected annual inventory cost at the optimal order quantity? What is the re-order point?
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
Bolts are randomly selected until a 5 mm bolt is obtained. The outcomes are the sequences of bolts that can be selected. So one outcome is 1, and the other is 342. List the equally likely outcomes.
Suppose you compute a simple linear regression on a single sample. Then you find additional data and recompute the regression on the larger sample and that the result is an increase in the regression slope.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Assume half of the 200 passengers are men. What doorway height satisfies the condition that there is a 0.95 probability that this height is greater than the mean height of the 100 men?
You work at a hospital that has always had about 100 emloyees staffed at night. You think that the number of employees staffed at night has recently decreased and would like to test this claim.
The number of false alarms a building fire alarm system registers has a Poisson distribution with a mean of 6 false alarms per year. The variance of the number of false alarms is what?
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