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The personnel director of a large firm has summarized a random sample of last year's absentee reports in the accompanying contingency table. At the 0.01 level of significance, test the independence of age versus length of absence.
1. a survey was conducted to measure the height of ment. in the survey respondents were grouped by age. in the 20-29
If HIV virus is actually present, the probability that ELIA test will give a positive result from ELISA is .01. If ELISA has given a positive result, use the Bayes' theorem to find the probability that the HIV virus is actually present.
a. If cork diameter is a normally distributed variable with mean value 3.04 cm and standard deviation .02 cm, what is the probability that a randomly selected cork will conform to specification?
(b) Which common bases can be used to completely remove a proton from acetone?
in a test of the effectiveness of garlic for lowering cholesterol 42 subjects were treated with garlic in a processed
question suppose an influenza epidemic strikes a city. in 10 of families the mother has influenza in 10 of families
Sony's new optical disk system prototype tested and claimed to be able to record an average of 1.2 hours of high-definition TV.- Assume n = 10 trials and σ = 0.2 hour. Give a 90% confidence interval.
a regional director responsible for business development in the state of pennsylvania is concerned about the number of
Construct a hypothesis test to determine whether the average weight of a Smoky Bear moving van is more that 12,000 lb. Us a 5% level of significance.
q1. in a study of the effects of stress on illness a researcher tallied the number of colds people contracted during a
An English professor would like to test the relationship between an English grade and the number of hours per week a student reads. A survey of 500 students resulted in the following frequency distribution.
A correlation between variables, however, does not automatically mean that the change in one variable is the cause of the change in the values of the other variable. Correlation as a statistic cannot explain why or how the relationship between two..
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