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(i) Carry out a two-sample t-test to compare the mean time between occurrences of safety violations for operator "A" to that for operator "B"; carry out a second two-sample t-test comparing the means for operator "A" to that for operator "C". Are these valid tests?
(ii) Carry out a MWW test to compare the safety performance of operator "A" to that for operator "B" and a second MWW test to compare operator "A" to operator "C". Are these valid tests? Interpret your results and compare them to the results in (i). What conclusions can you reach about these operators and how safety conscious "B" and "C" are in comparison to "A"?
what is the proportion of the total area under the normal curve within plus and minus two standard deviations of the
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries.
in a small town the relationship between robberies and police officers on aduty has been collected. x represents the
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
A mean of 200 and a standard deviation of 20. Determine the number of boxes,x, where 80% of the number of boxes received is less than x.
Find the probability of selecting a male and find the probability of selecting a female manager and compute the probability of selecting a male worker given that he is labor.
A random sample of 36 customers is selected. What is the probability that the average time spent per customer is between 2.9 and 3.2 minutes?
Find a lower bound for the probabilities, under the assumption that the Xn's are mutually independent.
he life expectancy of a brand of hair dryer is normally distributed wiht a mean of four years and a standard deviation of 8 months.
Consider two urns with the following composition: Urn 1 contains 5 red and 15 black balls, Urn 2 contains 8 red and 12 black balls.
What type of statistical data is best represented by apie diagram? Illustrate your answer with Example. What conditions must generally be borne in mind while presenting statistical data?
Determine the coefficient of determination, r2, and interpret its meaning. Find the standard error of the estimate. How useful do you think this regression model is for labor hours?
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