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The stem-and-leaf display below gives the test scores for the students in Prof. Jones' economics class. Use the display to answer the following questions.
An economic researcher would like to know whether he can reject the null hypothesis at the 0.10 level, that no more than 20% of the households in Pennsylvania make more than $70,000 per year.
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
After polling every 8 th graduate, a major university estimated annual salary of its alumni to be $103,000. What sampling technique was used?
The manager of Petroco service station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor..
A computer manufacturer offers a help line that purchasers can call for help 24 hours a day, 7 days a week. Clearing these calls for help in a timely fashion is important to the company's image.
An overnight express company must include seven cities on its route. How many different routes are possible, assuming that it matters in which order the cities are included in the routing?
Compute the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83 last month.
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
Developing project network using AOA that determines completion times.
Determine the probability that none of the 20 disjoint intervals Ij will contain more than one of the random variables X1...X12.
If there is a difference between the two groups of scores. Briefly explain how the difference may have been caused by the treatments.
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