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The service manager of Appliance Universe has recorded the times for a simple random sample of 50 refrigerator service calls taken from last year's service records. The sample mean and standard deviation were 25 minutes and 10 minutes, respectively.
a. Construct and interpret the 95% confidence interval for the mean.
b. It's quite possible that the population of such times is strongly skewed in the positive direction - that is, some jobs, such as compressor replacement, might take 3 or 4 hours. If this were true, would the interval constructed in part (a) still be appropriate? Explain your answer.
a market researcher at a major clothing company that has traditionally relied on catalog mail-order sales decides to
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Find the probability that 4 of the 5 committee members belong to a union.Find the probability using hypergeometric distribution.
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone. What is the value of q-hat?
q1 can you describe a data set for which one would one would prefer to use the median rather than the mean?q2 can you
If one uses the LS linear regression to make predictions, which of the following statements is true? (a) The predictions tend to be too high for large x's. (b) The predictions tend to be too high for intermediate x's. (c) The predictions tend to b..
Moving average forecasting models are powerful tools that help managers in making educated forecasting decisions. A moving average is mainly used to forecast short historical range data. This tool along with other forecasting tools is now computer..
A ski shop manager claims that the average of the sales for her shop is $1800 a day during the winter months. Fifty winter days are selected at random
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q1. a researcher hypothesizes that individuals who listen to classical music will score differently from the general
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