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In a recent year, the mean wait for repairs for Verizon customers was 36 hours. In an effort to improve service, a new repair process was developed. This new process, when used on a sample of 90 repairs, resulted in a sample mean of 33 hours and a sample std. dev. of 10 hours.
(a) State the null and alternative hypotheses.
(b) Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
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The data below shows the time to process an inpatient admission, before and after a system usage training session was given. The following hypotheses were formulated for this study.
Also include information about the number of participants you would assess and how you would go about estimating effect size and statistical power (when relevant).
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One of the major measures of the quality of service provided by any organization is the speed with which responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a major ..
Find out the probability that temperature of oven will range from 460 to 470 F?
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Research on new juvenile delinquents revealed that 38% of them committed another crime. What is the probability that 40 or fewer of the delinquents will commit another crime?
Compare a tabular cum sum chart using standardized values h = 5 and k = 1/2. What is the information you learn.
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