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A manufacturer of intraocular lenses is qualifying a new grinding machine and will qualify the machine if there is evidence that percentage of polished lenses that contain sur¬face defects does not exceed 2%. A random sample of 240 lenses contains 5 defective lenses.
(a) Formulate and test an appropriate set of hypotheses to determine if the machine can be qualified. Use a = 0.05. Find the P-value.
(b) Explain how the question in part (a) could be answered with confidence interval.
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
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Formulate the appropriate null and alternative hypotheses to test the manufacturer's belief. Using the sample mean of 99.2, compute a 90% confidence interval. Show the computation, and interpret in one sentence the interval you compute.
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A person must score in the upper 2% of the population on an IQ test to qualify for member ship in Mensa, the international high-IQ society. If IQ scores are normally distributes with a mean of 100 and a standard deviation of 15, what score must a ..
When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:
The average income of 11 families who reside in a rural area of the Midwest is $60,213, with a standard deviation of $2009. At α =0.05, can it be concluded that the families who live in the cities have a higher income than those who live in the ru..
If HIV virus is actually present, the probability that ELIA test will give a positive result from ELISA is .01. If ELISA has given a positive result, use the Bayes' theorem to find the probability that the HIV virus is actually present.
Using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 7.3? Explain.
Let x be a random variable that represents the commute time of teachers in a large urban area. If x is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes, find the commute time which is at the top of the bottom 25..
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