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A manufacturer claims the average life of a product is 500 hours. The lifetime of the product is assumed to follow an exponential distribution. What is the probability that the product will last less than 200 hours?
Suppose you obtain a 100 bag random sample by taking 25 subgroups of 4 bags each, the mean weight of the 25 subgroups was 16.00 ounces with a total of the subgroup ranges of 87.5 oz.
the lifetime of a semiconductor laser has a lognormal distribution and it is known that the mean and standard deviation
Henry performed a two-tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to complete his obt.with this tcv. Is he more likely to make a type I or II err..
As a sample size approaches infinity, how does the student's t distribution compare to the normal z distribution? When a researcher draws a sample from a normal distribution, what can one conclude about the sample distribution? Explain.
Delta Airlines quotes a flight time of 2 hrs, 5 minutes for its flights from Cincinnati to Tampa. We belive that actual flight times are uniformly distriubted between 2 hours and 2 hours 20 minutes.
the probability of pass a test is 0.76 at a particular school. suppose we randomly select a class of 10 students from
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
question a multiple-choice test has 6 questions. there are 4 choices for each question. a student who has not
Identify a research question from your professional life, research interests, or everyday experience that could be addressed by this analysis.
A telescpoe manufacturur wants its telescopes to have standard deviations in resolution to be significantly below 2 when focusing on objects 500 light-years away.
State the hypotheses. State the decision rule & sketch it. Find the sample proportions & z test statistic.
past experience shows that ever new book by a certain publisher captures between 4 and 12 of the market. what is the
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