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The data, the statistic, and the parameter are all values used to describe a statistical situation. How does one distinguish among these three terms? Give an example
Suppose the following data are the ages of Internet users obtained from a sample. Use these data to compute a Pearsonian coefficient of skewness.
If WH is implicated, the firm may face a reputation loss even if no lawsuit is filed. For what values of that reputation loss would issuing the recall be preferable, in terms of EMV?
Many states run lotteries, giving away millions of dollars if you match a certain set of winning numbers. How are those numbers determined? Do you think this method guarantees randomness? Explain.
The actual weight of soap powder in a box has a normal distribution with a mean of 33 oz. and a standard deviation of 0.8 oz. What proportion of packets are underweight.
The personnel director of a large firm has summarized a random sample of last year's absentee reports in the accompanying contingency table. At the 0.01 level of significance, test the independence of age versus length of absence.
To revise an existing inventory system, a company needs to know something about the lead time for orders it places for a critical part. The company looks at the last 20 orders placed and finds that the lead time in days are:
1. What is the probability that 210 to 235 intravenous drug users in this study will be HIV positive. 2. What is the probability that at most 230 intravenous drug users in this study will be HIV positive
In each of the following cases, would the mean or the median probably be higher, or would they be about equal?
A survey found that out of 200 workers, 168 said they were interrupted three or more times by phone messages, faxes, etc.
What information is provided by the numerical value of the Pearson correlation? For the following scores, compute the Pearson correlation:
a. Estimate a multiple linear regression model and interpret the coefficient for x2.
Compute the nonresponse rate for this study. Does this influence how you interpret these results? Write a short discussion of this issue.
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