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Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. The results from 100 disks are summarized as follows:
a) If a disk is selected at random, what is the probability that its scratch resistance is high and its shock resistance is high? Round your answer to two decimal places (e.g. 98.76).
b) If a disk is selected at random, what is the probability that its scratch resistance is high or its shock resistance is high? Round your answer to two decimal places (e.g. 98.76).
A post office has a single line for customers waiting for the next available postal clerk. There are two postal clerks who work at the same rate.
What is the advantage of a randomized experiment in which the investigators randomly assign treatment conditions to subject over an observational study in which the subject self-select the treatment groups?
consider the following joint probability density function of the random variables x and y fxy 3x-y9 for 1ltxlt3 and
What is the probability that a home has a garage but not a swimming pool?
a company that manufactures bookcases finds that the average time it takes an employee to build a bookcase is 23 hours
Women in the U.S. Air Force have hands that are 6.9 inches on the average (from the tip of the middle finger to the heel of the hand). The standard deviation is 0.34 inches. Assume that hand length is normally distributed.
Media Disk, Inc. duplicates over a million 3.5" floppy disks each year by copying masters to stacks of blank disks. The company buys its blank stock from two different suppliers, A and B.
athe manager hires you to analyze the data she collects and the results for the above questions are as
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
What kinds of plots are useful in data screening? What can you do if your data do not meet the assumptions of your statistic?
Standard deviation of 3.2 days. If a nursery plants 100,000 of these seeds, how many will germinate in less than 20 days?
The natural number 28A9B consists of different numbers and A is not equal to 0. When the number is divided by 9 the remainder is 7 and when it is divided by 5
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