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An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in that same city. Samples were taken on two occasions, Sept. 1,2001 and Sept. 1, 2004.
City
Sept 1, 2001
Sept. 1, 2004
Wooster
1.8
1.7
Midland
2.0
Beaumont
22
2.5
Mara:bester
1.9
a particular intersection in delaware is equipped with a surveillance camera. the number of traffic tickets issued to
The following data are salaries of seven randomly chosen managers of furniture-making ?rms and eight randomly chosen managers of paper product ?rms. The data are in thousands of dollars per year.
in a sample of children given a new flu vaccine a large number of the children develop a neurological disease. parents
elementary 201 766 148 218 519 396 274secondary 50 280 27 41 108
Pizza House offers 4 different salads, 5 different kinds of pizza, and 4 different desserts. How many different three course meals can be ordered?
a computer program can make calls to two subroutines a and b. in a randomly chosen run let x be the number of calls to
Which of the following would be an appropriate alternative hypothesis?
Cholesterol levels are measured as followed: 185 225 240 196 175 180 194 147 223. Generate a 95% confidence interval for the true mean total cholesterol levels in children?
To find the probability values in case of raw data, binomial, normal
The number of senior citizens (65 and older) in the US in millions n years after 1990 can be estimated using the formula
What is the probability that both defective lights will be found within three trials?
a jobs are sent to a printer at an average of 4 jobs per hour.i what is the expected time between jobs?ii what is the
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