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1. In a certain part of a city, the average price of homes in 2000 was $148,822, and in 2001 it was $155,908. Suppose these means were based on a random sample of 100 homes in 1997 and 150 homes in 1998 and that the sample standard deviations of sale prices were $21,000 for 2000 and $23,000 for 2001. Find a 98% con?dence interval for the difference in the two population means.
pick a collection of values in reference to various variables from a web site. describe and list a few examples of your
a company that manufacturers coffee for use in commercial machines monitors the caffeine content in its coffee. the
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho= 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
the length of time until the breakdown of an essential piece of equipment is important in the decision of the use of
If there are 20 people in the room, 12 men and 8 women, what is the probability of picking two people, without replacement, getting a woman on the first and a man on the second?
The mean of a standard normal probability distribution.
For the following, describe the target population, sampling frame, sampling unit and observation unit. Is there any selection bias or inaccuracy of responses?
Enter the data and use the appropriate commands to find the mean, median, mode, sample standard deviation, population standard deviation, 10% trimmed mean, and data count.
in conjunction with the housing foreclosure crisis of 2009 many economists expressed increasing concern about the level
among eighteen computers in some store six have defects. five randomly selected computers are bought for the university
Develop separate schedules by using the FCFS,SPT and EDD rules. Compare the schedules on the basis of average flow time,the average early time and average past due hours for any order.
a consumer group decides to test the effectiveness of a new organic laundry detergent. they intentionally get grass
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