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An accounting firm annually monitors a certain mailing services performance. one parameter of interest is the percentage of mail delivered on time. in a sample of 306,000 items mailed between dec. 10 and mar. 3 - the most difficult delivery season due to bad weather and holidays - the accounting firm determined that 269,700 items were delivered on time. use this information to make a statement about the likelihood of an item being delivered on time by that mailing service.
Assuming a confidence level of 95%, the likelihood of an item being delivered on time(when it was mailed between Dec. 10 and Mar. 3) is in the interval ____ , ____
Round to four decimal places as needed.
A shipment of 150 television sets contains three defective units. In how many ways can a vending company buy three of these units and receive (a) no defective units, (b) one defective unit, and (c) at least two good units?
As the financial manager of ABC computers, you are ready to make some decisions. You are trying to see where revenues are going?is the company ready to expand, and if so, when?
Out of the total nuts manufactured by a company 0.5 percent became defective. The nuts are supplied in packets of 40. Find out the probability number of packets containing.
Statistical aptitude scores are known to be normally distributed, with mean = 50. A researcher has designed a new program intended to improve students statistical aptitude, and has enrolled a sample of 30 students in it.
the quarterly returns of a group of 59 mutual fund with the mean of 3.6 and standard deviation of 5.3 can be modeled by
The manager of a Farmer Jack Super Market would like to know if there is a preference for the day of the week on which customers do their shopping.
mars inc. claims that they produce mampms with the following distributions
edward and his friends cannot go outside when it is sunny because they are vampires. edwards hometown forks washington
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
If they must form an ethics subcommittee of 4 members, how many different subcommittees are possible?
Based on these data, does it seem that strength of relationship between sales and promotions expenditures is enough to permit using linear regression forecasting model? Describe why?
A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. Is there evidence of an improvement on the final?
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