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In 1992, FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive.
a) Construct a 95 percent confidence interval for the population proportion of positive drug tests.
b) Why is the normality assumption not a problem, despite the very small value of p?
Computing probability values using normal distribution - Find the proportion of the observations will fall in the interval from 40 to 60?
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
Determine the probability that the number of people who show up will exceed the capacity of the plane?
In the accompanying table, the random variable x represents the number of televisions in a household in a certain country. Determine whether or not the table is probability distribution. If it is a probability distribution, find its mean and stand..
Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
Determine the probability of fatal accident over a lifetime? Describe your reasoning carefully. Hint: Suppose independent events. Why might the supposition of independence be violated?
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
Find the probability that he will answer all 10 questions correctly.
Utilize the given degree of confidence also sample data to construct a confidence interval for population proportion.
Test the proportions of yellow fire trucks have a significantly lower accident rate.
A communication network transmits binary digits, 0 to 1, where each digit is transmitted 10 times in succession. During each transmission, there is a 0.995 probability of accurate transmission.
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