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A joint frequency dist"n for the number of injuries in the US by circumstance and sex is as shown in the following contingency table. Frequencies are in millions. Circumst. B. How many cells does the contingency table have? C. Find the probability that an injured person was hurt at work. P( P( )=? D. Find the probability that the injured person is female. P( P( )=? E. Find the probability that the injured person is female and was hurt at work. P( P( )=? F. Given that an individual was hurt at work, what is the probability that it is a female.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
Suppose x has a uniform probability distribution. Is the amount dispensed by the machine a discrete or a continuous random variable? Find the mean and standard deviation for the distribution.
What does a confidence interval tell us and why is it importance to use a confidence interval?
Markups on Supertrex seen at other local stores range from 20% to 45%, Kruger decides that its markup had best be in this range as well. Formulate as an LP Problem.
In 1992, the FAA conducted 90,000 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, construct a 95 percent confidence interval for the population proportion of positive drug tests.
When studying the simultaneous responses to two categorical questions, we should set up a:
Construct a 90 percent confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of +/-} 0.03 grams with 90 percent confidence?
Find the expected value when you pick 4 and when you pick 5, betting $1 each time. Based on your results from parts a and b, are you better off picking 4 numbers or picking 5? Explain your reasoning.
Dinner B which costs $135.30 for dinner submitted by salesperson with mean cost of $117.50 and standard deviation of $30 per dinner?
It has been reported that 80% of taxpayers who are audited by the Internal Revenue Service end up paying more money in taxes. Assume that auditors are randomly assigned to cases, and that one of the ways the IRS oversees its auditors is to monitor..
If the researcher computes the t-statistic to be 4.2 and t-value found in t table for df=60 and level of significance of 0.5, is 2.0 researcher would accept or reject null hypothesis.
Below you are given a partial computer output based on a sample of 16 observations.
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