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Constructing a Pareto chart. You manage the customer service operation for a maker of electronic equipment sold to business customers. Traditionally, the most common complaint is that equipment does not operate properly when installed, but attention to manufacturing and installation quality will reduce these complaints. You hire an outside firm to conduct a sample survey of your customers. Here is the percent of customers with each of several kinds of complaints:
(a) Why do the percents not add to 100%?
(b) Make a Pareto chart. What area would you choose as a target for improvement?
Explain why we need to use the t distribution. What assumption do you need to make?
Use a calculator or appropriate computer software to verify that, for the preceding data, xbar = 5.1.
Create a dummy variable based on the variable gender. The dummy should equal 1 for male children and 0 otherwise. Name this variable gender dum.
As soon as one component fails, the entire system will fail. Suppose each component has a lifetime that is exponentially distributed with λ = .01 and that components fail independently of one another.
Calculate the Average yield per acre, calculate the Standard deviation and explain the difference between a one sample and a two sample hypothesis test; provide an example of each.
Run a multiple regression and interpret all the findings, R 2 , F, IV coefficients, and the intercept. Then in paragraph format, identify and report the following:
In a sample of 900 U.S. adults, 208 dine out at a restaurant more than once per week. Two U.S. adults are selected at random from the population of all U.S. adults without replacement. Assuming the sample is representative of all U.S. adults.
question as a student you probably have noticed a curious phenomenon. in every class there are some students who zip
mark gershon owner of a musical instrument distributorship thinks that demand for guitars may be related to the number
the us department of education reports that 46 of full-time college students are employed while attending college. a
A distributor of pre-washed shredded lettuce is opening a new plant and considering whether to use mechanized process or manual process to prepare the product.
When testing the executive's (using a 1% level ofsignificance), what can you conclude concerning the null hypothesis? Reject the null hypothesis or Fail to reject the null hypothesis?
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