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A company has developed a new ink-jet cartridge for its printer that it believes has a longer lifetime on average than the one currently being produced. To investigate its length of life, 240 of the new cartridges were tested by counting the number of high-quality printed pages each was able to produce. The sample mean and standard deviation were determined to be 1511.4 pages and 35.7 pages, respectively. The historical average lifetime for cartridges produced by the current process is 1502.5 pages. At α = .05, test the claim that the new cartridge has a longer lifetime.
The Bureau of Labor Statistics announced that in January 2013, of all adult Americans, (143,322,000 were employed), (12,332,000 were unemployed), and 89,008,000 were not in the labor force. Use this information to calculate:
The spot rate of the Australian dollar is $.62. The 1-year forward rate of the Australian dollar is $.60. The Australian 1-year interest rate is 9 percent.
In one state, 52% of the voters are Republicans, and 48% are Democrats. In a second state, 47% of the voters are Republicans, and 53% are Democrats. Suppose a simple random sample of 100 voters are surveyed from each state. What is the probability..
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha :
the mean brain volume for a group of healthy adults is collected and the mean brain volume of adults diagnosed with
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
The manager of a local gymnasium has determined that the length of time patron spend at the gymnasium is normal distributed with mean 80minutes and standard deviation 20 minutes. What is the patrons who spend more than 120 minutes at the gymnasium..
What is the cost structure of the air industry? How does it compare with other modes? How does this affect pricing, particularly for passengers? Be sure your answer includes examples from either advertising or the
In a certain college, 20% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, what is the probability that exactly 2 belong to an ethnic minority?
1.one characteristic of billiard balls is their elasticity - the bounce they get when striking one another. a
the acceptable level for insect filth in a certain food item is 3 insect fragments per 10 grams. a sample random of 60
A compute manufacturer is about to unveil a new,faster PC.The new PC is faster but intial tests incidcate there is more variation in the processing time.
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