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Anonymity and confidentiality in mail surveys. Some common practices may appear to offer anonymity while actually delivering only confidentiality. Market researchers often use mail surveys that do not ask the respondent's identity but contain hidden codes on the questionnaire that identify the respondent. A false claim of anonymity is clearly unethical. If only confidentiality is promised, is it also unethical to say nothing about the identifying code, perhaps causing respondents to believe their replies are anonymous?
Suppose it costs $2,500 to buy a defibrillator. Find the expected value of owning a defibrillator if there is a 4% probability that "Silver's Gym" will lose a lawsuit regarding its operation, with each lawsuit resulting in "Silver's Gym" being lia..
A company that relies on Internet-based advertising linked to key search terms wants to understand the relationship between the amount it spends on this advertising and revenue (in $).
A company called CRW runs credit checks for a large number of banks and insurance companies. Credit history information is typed into computer files by trained administrative assistants.
Assuming that serum cholesterol levels for women ages to are normally distributed, find a confidence interval for the mean serum cholesterol level of all women in this age group. Then complete the table below.
Using the probability distribution table, what is the value of P(X = 2 or X = 0)?
Compute a standardized score to correspond to the reported percentage of 61%. Comment on whether or not you believe that people in the sample could all have been telling the truth, based on your result.
Find a graph other than a histogram that shows the distribution of a quantitative variable in a newspaper or magazine article.
What are the center line and control limits for a p chart for plotting monthly proportions of defective orders? What is the smallest number of bad orders in a month that will result in a point above the upper control limit?
A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers.
What are the assumptions necessary to use the z-series test? What are the assumptions necessary of use the t-series test?
Patient A was infected with the HIV/AIDS virus due to a previous blood transfusion and Patient B was infected with the HIV/AIDS virus due to a long-term history of illegal drug use. Unfortunately, there is not enough blood to be distributed to bot..
Assuming this finding to be based on a simple random sample of 200 attempts, construct and interpret the 90% confidence interval for the population proportion of the time the Wal-Mart site was available during this period.
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