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The famous Y. S. Chang Restaurant is open 24 hours a day. Waiters and busboys report for duty at 3 A.M., 7 A.M., 11 A.M., 3 P.M., 7 P.M., or 11 P.M., and each works an8-hour shift. The following table shows the minimum number of workers needed during the six periods into which the day is divided. Chang's scheduling problem is to determine how many waiters and busboys should report for work at the start of each time period to minimize the total staff required for one day's operation. (Hint: Let X1 equal the number of waiters and busboys beginning work in time period i, where i = 1, 2, 3, 4, 5, 6.)
Scientist does n ot believe that water ph is 7. She wants to test the null hypothesis that the true level of ph is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a ph of 7. Which p-value will she reject..
The maximum allowable payback and discounted payback statistic for the project are 2 and 2.5 years, respectively. Use the NPV decision rule to evaluate this project; should it be accepted or rejected?
At a particular location on a river the number of fish caught per man-hour of fishing effort has a Poisson distribution with ?= 1.3 fish per man hour. Find the following probabilities:
The new Lucky Lady Casino wants to increase revenue by providing buses that can transport gamblers from other cities. Research shows that these gamblers tend to be older, they tend to play slot machines only, and they have losses with a mean of $1..
On average, how long does patient stay in ER? On average, how long does Potential Admit stay in ER? On average, how many patients are in the ER?
In drawing an inference using a single mean in hypothesis testing, you often have a choice between doing a z-test or a t-test. Many researchers will always choose to do the t-test even under circumstances where the z-test would work as well.
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
The bank wishes to inform prospective customers that '99 times out 100 we can process your application in q working days'. Assuming that the normal distribution is still an adequate model, calculate q.
Why is effective sampling important when performing a hypothesis test? What could happen if your sample is not appropriate to your study?
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
A consumer organization wants to know if there is a difference in the price of a particular toy at three different types of stores. The price of the toy was checked in a sample of five discount toy stores, five variety stores
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them.
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