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A company makes toys that are either working or not working. There is an imperfect test run on the toys.
800 toys are randomly chosen
The toys are tested with the imperfect test, then humanly checked to see if the answer was right.
448 are working and test as working.
60 are not working but test as working.
112 are working but test as not working.
180 are not working and test as not working.
a) What is the probability an item tests as working?
b) What is the probability of the test giving the right answer?
Observations was x ¯ = 119.8 (actually 119.7692), and the 14th observation, somewhat of an outlier, was 158. What is the value of x ¯ for the entire sample?
The results are shown here. At Alpha = .01, can it be concluded that the sessions help to improve the students' mathematical skills?
A life insurance policy has determined that each week an average of seven claims is filed in its Nashville branch. What is the probablity that durning the next week exactly seven claims will be filed?
below you are given ages that were obtained by taking a random sample of 9 undergraduate students. assume the
A bicycle manufacturer makes two types of 21-speed bicycles, Road Bikes and Track Bikes. He has sales staff who sell the bikes on commission. Calculate the unit contribution margin for each product
What is regression to the mean, and why is it a threat to the validity of research designs in which random assignment has not been used?
6% are too long and can be used after being cut, and 4% are too short and must be scrapped. What is the probability that a randomly selected bolt can be used?
At the .01 significance level, can we conclude that the 30-yeer mortgage rate for small banks is less than 6 percent? Estimate the p -value.
a distribution of scores has mu 40 and sigma 18a. describe the distribution of sample means based on samples of n36
Testing a random number generator. Our statistical software has a "random number generator" that is supposed to produce numbers scattered at random.
a company purchases shipments of machine components and uses this acceptance sampling plan randomly select and test 20
there are 1000 students in the senior class at a certain high school. the high school offers two advanced placement
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