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In a bank call center, it is determined over a one-year period that 30% of the outgoing calls are answered by a live person, as opposed to being unanswered or picked up on voice mail. The center makes over 200,000 outgoing calls per year. There is an operator at the center who places 25 outgoing calls in a one-hour period. What is the probability that this operator will get live answers on 7 or more calls?
Why crime statistics should be collected, how they are used, and how analysis of those statistics could benefit the community.
Sample of 25 rockets in his latest spaceship. He thinks they might weight less than the average rocket. The sample has on average 102 lbs with a standard deviation of 10 lbs. The average rocket weights 106 lbs.
Variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used. The distribution of the number of errors per invoice for the manual system is as follows
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
According to a recent poll, 53% of Americans would vote for an incumbent president. If a sample of 100 people results in 45% who would vote for the incumbent, test the claim that the percentage is 53%. Use a .10 significance level.
A researcher tested the reading ability of two groups of primary care patients. The scores on the test range from 1 to 9 with 9 indicating a high degree of reading ability and 1 very limited reading ability.
A local bank reported to the federal government that its 5,246 saving accounts have a mean of $1,000 and standard deviation of $240.
Find the sample space for the number of outcomes (you don't need to list the possible outcomes, just how many possible outcomes there are).
Develop a 99% confidence interval for the population proportion.
The number of cases of merlot wine sold by a Paso Robles winery in an 8-year period follows:
Suppose that we are interested in the proportion of the 70 students in the lunchroom cafeteria that smokes. Is the normal approximation for the proportion p = r/n valid?
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