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A lighting vendor has described its incandescent bulbs as having normally distributed lifetimes with a mean of 2000 hours and a standard deviation of 100 hours. The vendor is faced with an especially demanding industrial customer who insists on conducting a longevity test before committing to a very large order. The customer's purchasing department plans to test a simple random sample of 16 bulbs and to place the large order only if the sample mean is at least 2050 hours.
Given the longevity of the vendor's bulbs and the test the potential customer will be carrying out, what is the probability that the vendor will get the contract?
What is the probabillity that in a random sample of 1,200 undergraduate business students, 336 or more will major in accounting?
an import threshold for mercury in crayfish is 9 parts per billion ppb. a study obtained a random sample of 120
obtain the linear correlation coefficient for the data. round your answer to three decimal places. the data below show
fifty sampling units of equal size were inspected and the number of nonconforming situations was recorded. the total
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
If an original set of measurements is made in inches and has mean of 36 and variance of 144, what will be the mean, variance, and standard deviation if:
suppose that 4 candidates run for the governor of a state. how many ways are there in which the numbers of their
Its mean is 139 and its standard deviation is 12. Approximately how many terms can you expect to find between the values of 115 and 163?
the time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be
Hypothesis Testing, 2. We wish to test the claim that the mean body mass index (BMI) of men is equal to the mean BMI of women. Use the data to the right to test this claim.
a company is drilling for oil. when it strikes oil it expects a profit of 100000. the cost of drilling is 5000. if the
the birth weights for twins are normally distributed with a mean of 2353 grams and a standard deviation of 647 grams.
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