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Electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 seconds with a population standard deviation of 30 seconds. Can the company claim that they are faster than the average utility at α = 0.05?
What is the null hypothesis? What is your decision if a = 0.01?
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. make an interference based on the results of the study.
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
Suppose that 10 years ago the average annual expense for stock funds was 1.19 percent. Let µ be the current mean annual expense for all stock funds, and assume that stock fund annual expenses are approximately normally distributed.
Explain can you find out statistical support in this poll for that statement. When it comes to the war in Iraq, among which of the subsiquent statements comes closer to your point of view.
An airline estimates that 90% of people booked on their flights actually show up. If the airline books 71 peopleon a flight for which the maximum number is 69, what is the probability that the number of people who show up will exceed the capacity ..
what is the probability of obtaining at least 6 cases in this class if the nationwide rate holds True?
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
Gallup Polls When Gallup and other polling organizations conduct polls, they typically contact subjects by telephone. In recent years, many subjects refuse to cooperate with the poll.
How many ways can she choose 4 dissimilar rides if order does not matter? If she has chosen the first weeks rides, how many ways can she choose four more different rides for second week? Suppose that order does not matter.
Briefly describe correlational research. Name a variable from the workplace that might prove to provide a correlational relationship and explain why you would choose these two?
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