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Seitz's list of several hundred business-to-business customers continues to grow. Managers would like to know whether the average dollar amount of sales per transaction per customer has changed from last year to this year. Suppose company accountants sampled 2D customers randomly from last yea r's records and determined that the mean sales per customer was $2.3oo, with a standard deviation of $5D?. They sampled 25 customers randomly from this year's ?les and determined that the mean sales per customer for this sample were $2,450, with a standard deviation of $54G. Analyze these data and summarize your ?ndings for managers. Explain how this information can be used by decision makers. Assume that sales per customer are normally distributed.
Assume the earnings from this investment project is a normal distribution. What is the probability that you will lose money or earn nothing from this project.
a. Find the least-squares regression line of y on x. b. Estimate the blood pressure of a person whose age is 45 years.
What were the effects of Alexander's reign on the history and culture of the Mediterranean world? (List at least 5 things)
What is the margin of error? What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience?
Comparing the response times between 2 cab companies. companies A and B were each called at 50 randomly selected times. the calls to company A were independently made from the calls to company B. company A had a mean response time of 8.5 minutes with..
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
apples market share in the smart phone market represents a proportion of 0.1835. if apple conducts a survey nationwide
Different methods - a traditional method, and a web-based self-paced method. Can he conclude, at α = .05, that the test scores in the web-based self-paced method are lower?
Abnormalities. In the 1980s it was generally believed that congenital abnormalities affected about 5% of the nation's children.
The NBA teams with the 13 worst records at the end of the season participate in a lottery to determine the order in which they will draft new players for the next season. How many different arrangements exist for the drafting order for these 13 te..
An economics course are independent events, what is the probability that a randomly selected student is registered in either a math course or an economics course?
What is the amount of the expected disbursements for Quarter 3? Assume a 360-day year.
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