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A bank branch uses an improved process for serving customers during 12-to-1 p.m. The waiting time, in minutes (defined as the time the customer enters the line to when he/she reaches the teller window), of a sample of 15 customers during this hour is recorded over a period of one week as: 9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17 9.91 5.47
a. Compute mean, median, Q1, and Q3. b. Compute variance, standard deviation, range, interquartile range, CV, and minimum and maximum Z scores. Are there any outliers? Explain. c. Are the data skewed? If so how?d. As the customer walks into the branch office during lunch hour, he asks the branch manager how long he can expect to wait. The branch replies "Almost certainly less than five minutes." On the basis of results of (a) through (c), evaluate the accuracy of this statement. had waiting time greater than 5 minutes, so the customer is likely to experience more than 5 minutes waiting time. The manager overstated the bank's service record while replying the customer)
Two pediatricians want to investigate a new laboratory test that identifies streptococcal infections. Dr. J uses the standard culture test, which has a sensitivity of 90% and a specificity of 96%. Dr. M uses the new test, which is 96% sensitive an..
At the end of the Halloween Festival the organizers estimated that a family of participants spent in average $50.00 with a standard deviation of $15.00. If 49 participants (49 = size of the sample) are selected randomly, what's the likeihood that ..
Develop one research question and formulate a hypothesis which may be tested with linear, bivariate regression analysis.
Interpret this data using regression and interpret all the findings, R 2 , F, IV coefficient, and the intercept.
Find would be answer to part(a) if there were only single server which can serve customers twice as fast (i.e, with service rate four customers per hour)?
Mike works in a quality at a well known saw blade company. An inpsector on his team has uncovered an issue with the kerf dimension on the bandsaw blade line.
You are trying to get an important new customer to buy a product that you produce. Their decision to buy depends on the speed at which you can produce the product once they have placed the order.
A random sample of size 25 is taken from a normal population having a mean of 80 and a standard deviation of 5. A second random sample of size 36 is taken from a different normal population having a mean of 75 and a standard deviation of 3.
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
Payne (2001) gave participants a computerized task in which they first see a face and then a picture of either a gun or a tool. The task was to press one button if it was a tool and a different one if it was a gun.
Records also point to that interviewing committee of bank officers approves 85% of individuals they interview. Determine probability that Ann's loan request is approved.
Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 406 jawbreakers that weigh more than .4 ounces?
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