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Problem: A Telecommunications company recently installed a new speech recognition system for its repair calls. In their old system, operators had to press keys on the numeric keypad to answer questions, which led to longer time on service calls. on service calls. The company is conducting a study to examine the impact of the new system on the average duration of service calls. Average duration of service calls was 31.4 minutes prior to the installation of the new system. They analyzed a random sample of 25 service calls and obtained an average duration of service calls of 28.2 minutes. Based on historical data, the standard deviation of duration of service calls is known to be σ =7.2 minutes.
What is the P value of the the hypothesis test to determine if the system has changed the average duration of service calls ? (Use 4 DECIMALS)
Learning math through subliminal messages. A "subliminal" message is below our threshold of awareness but may nonetheless influence us.
What connections can you make between the political or economic histories of India, China, Thailand, Russia, Nigeria and the existence of modern slavery today?
In what way(s) is this histogram misleading? How can you change the frequency distribution so that the resulting histogram gives a clearer picture?
Brush your teeth The amount of time Ricardo spends brushing his teeth follows a Normal distribution with unknown mean and standard deviation.
What is the standard deviation for the sample proportion? What is the probablily that in this group over 18% of the new cars will be found to have electrical problems?
A financial institution has decided to open an office in a certain commu- nity if it can be established that the median annual income of families in the community is greater than $90,000. To obtain information, a random sample of 80 families was ..
Policyholders of a certain insurance company have accidents at times distributed according to a Poisson process with rate λ. The amount of time from when the accident occurs until a claim is made has distribution G.
a. Consider how the low response rate could bias the results of this study.
Heyman and Ariely (2004) were interested in whether effort and willingness to help were affected by the form and amount of payment offered in return for effort.
In a survey of 750 senior business executives by Business Week magazine, 56% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than people without the degree. Prepare a 92% confiden..
A medical research team studied the ages of 34 patients who had strokes caused by stress. The frequency distribution below summarizes the results. When trying to understand the stroke data, what would be the advantage of looking at a histogram ins..
State hypotheses, find the test statistic and critical value, and state conclusion. (3 decimal round)
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