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In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security relatd jobs and found that 1,143 were positive a. construct a 95% confidence interval for the population proportion of positive drug test. b. why is the normality assumption not a problem, despite the very small value?
Calculate the standard deviation of the number of available rooms in that sample. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
In the context of hypothesis testing regarding one mean, the test (Z or t) may be statistically significant at the 5% level, but not significant in a practical sense at all. Illustrate the meaning of this statement by citing 3 examples from any ar..
Suppose that weights of bags of potato chips coming from a factory follow a normal distribution with mean 12.8 ounces and standard deviation .6 ounces.
Is this a proper probability density function? How do you know? Find the mean, variance, and standard deviation of x, showing your work.
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At = .05, is a difference in the two amounts?
If there are no large cost disadvantages, the data suggest that we should proceed. B) Technical issue: Does the treatment effect depend on the past average sales?
When 6 telephones are received, all of them are free of defects. What is the written description of the complement of the above event?
The times required to assemble a product are normally distributed with a mean of 47.5 minutes and a standard deviation equal to 8.5 minutes. What percent of the assembly workers require: (do not include % symbol)
Display the data in scatter plot. Calculate the linear correlation coefficient. Use the scatterplot to make a conclusion about the type of correlation.
Approximately 34% of all university professors are extroverted Suppose you have classes with 5 Different professors. Find probability that 1 is extroverted? Find probability that 2 are extroverted.
A pilot survey revealed that 5 of the 50 sampled hold two or more jobs. How many in the workforce should be interviewed to meet your requirements?
If the writing scores for the population have a standard deviation of σ = 20, does the sample provide enough evidence to conclude that the new composition course has a significant effect?
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