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A biometric security devise using fingerprints erroneously refuses to admit 1 in 1000 authorized persons from a facility containing classified information. The device will erroneously admit 1 in 10,00,000 unauthorized persons. Assume that 95% of those who seek access are authorized. If the alarm goes off and a person is refused admission, what is the probability that really authorized?
The probability will be .90 that the sample mean will not differ from the true mean by more than 20 percent of the std. deviation. How large a sample should he take?
If the Consumer Price Index in June 2006 was 159.3 (1982-84=100), what does this indicate about prices from 1982-84 to June 2006?
Need to get quiz done online goodness of fit and test for independence need to get over 80%
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
Can you conclude that there is a higher proportion of U.S. companies offering high-deductible health insurance plans to their workers in 2006 than in 2005?
What percent of trucks logged more than 57,060 but less than 58,280 miles? What percent of Fords travelled 62,000 miles or less in the year?
A psychologist determined that the number of sessions required to obtain the trust of a new patient is 1, 2, and 3. Let x be the random variable indicating the number of sessions required to gain the patient's trust. The following probability fu..
A leasing firm claims that the mean number of miles driven annually,u , in its leased cars is less than 13500 miles. A random sample of 70 cars leased from this firm had a mean of 13207 annual miles driven.
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
(a) Give a 95% confidence interval for the mean ARSMA score of Mexicans. (b) What assumptions does your condence interval require?
A certain airplane has two alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is.02.
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
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