Find approximate probability
The thickness of wafers in semiconductor manufacturing has a mean of 10 micrometers and standard deviation of 0.8 micrometers. Find approximate probability that the average thickness of 49 wafers exceeds 10.15 micrometers.
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The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What assumptions do you need to make about the shape of the population distribution of all possible tax preparation times to make inferences
Chemical company claims the one majory product has on average 4.0 fluid oz of caustic materials per gallon.It further states that the distribution of caustic materials per gallon is normal and has a standard deviation of 1.3 fluid ounces. What pro
A survey of an urban university (population of 25,450) showed that 870 of 1100 students sampled supported a fee increase to fund improvements to the student recreation center. Using the 99% level of confidence, what is the confidence interval for
The main reason women seek medical attention for menopausal symptoms is hot flashes. Dietary supplements containing isoflavones derived from natural sources such as soy or red clover are marketed as an alternative treatment for such symptoms and a
The compressive strengths of a random sample of 64 specimens of an alloy yielded sample average strength of 5566 psi and sample standard deviation of 82 psi. Find a 95% confidence interval for the true average strength if the alloy.
Let X1, X2 be a random sample of size 2 from a population X with E(X)=mu and V(X) = 36. Let T1 = (2X1 + X2)/3 and T2 = (3X1 - X2)/3 be two unbiased estimators for mu.
Then respond to the following: What are some of the factors you would want to consider in assessing such a difference in mortality? Discuss possible explanations as to why the crude mortality rate is lower in Haiti than in the United States.
A motel accepts 340 reservations for 315 rooms on July 1, expecting 10 percent no-shows on average from past records. Use the normal approximation to the binomial to find the probability that all guests who arrive on July 1 will receive a room.
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