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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?
However one of the children fails to solve the peoblems, so the researcher has an undetermined score. what is the best measure of central tendency for these data?
Describe the sampling distribution of p-hat, the sample proportion of college students with the cell phones who send or receive the text messages with their phones.
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution. History suggests that the average if number of hurricanes formed during a year is 6.0 hurricanes.
Suppose the probability that a carton of eggs will contain at least one broken egg is 1/3. use a simulation of 20 trials to find the probability that the next three cartons will contain only unbroken eggs.
three contractors call them a b and c bid on a project to build an addition to the uva rotunda. suppose that you
If a worker at this fast food restaurant is selected at random, what is the probability that the worker earns more than 6. 75.
In the case of Castenedav. Partida, it was found that during a period of 11 years in Hilda County, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry.
Show that there is no rational number b/a whose square is 2, as follows: if b^2 = 2a^2, then b is even, so b = 2c, so, substituting and cancelling 2, 2c^2 = a^2.
Determine the critical value. Using the critical value rejection rule, what is the statistical conclusion?
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Thirty-five percent of the democrats and 70% of the republicans favor the bill. the bill needs a simple majority to pass. using a probability tree, determine the probability that the bill will pass.
You are a research analyst with a large research and development firm, Akron Research. Your firm performs studies and analysis for companies that need product, process improvement, manufacturing, and consulting research services.
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