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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?
What is the probability that exactly 3 tomatoes in a randomly selected tray of 20 tomatoes will be too ripe. In each tray of 20 tomatoes, how many would be expected to be too ripe?
Find the proportion of female college students whose height is greater than 65 inches. Then find the proportion of female college students whose height is no more than 65 inches.
For a population with a mean of μ = 50 and a standard deviation of σ = 10, how much error, on average, would you expect between the sample mean (M) and population mean for:
Given that x is a normal variable with mean u = 47 and standard deviation = 6.2, find:
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches.
Use Chebyshev's theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.
The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?
Assume you have drawn a simple random sample of 10 students from a college campus and recorded how many hours each student studies (X) during the ¯rst week of December, 2009. Results:
A standard deviation of 16. What is the probability that the mean glucose levels exceeds 115 in a sample of 12 patients.
The number of mathematics texts actually chosen, construct a table showing the values of the joint probability distribution of x and y.
Determine the area under the standard normal curve between z = 0 and z = 3. Determine the area under the standard normal curve to the right of z = 1. Determine the area under the stanard normal curve to the left of z = 1.5
Find the probability that the mean age of those doctors is less than 53.00 years. Assume that the variable is normally distributed.
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