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A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 3, 4, 6, 8, or 11 days last month. Number of days absent Probability 0 0.51 3 0.24 4 0.13 6 0.06 8 0.06 11 0 What is the variance of the number of days absent? 2.96 5.91 11.83 4.91
the percentage of alcohol in a certain compound may be considered as a random variable x with the following pdffx x
an effective way to catch salmon commercially is by gill netting. traditionally gill netters hang long monofilament
The data below were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries. Predict the number of injuries (provided there is a significant relationship) if 100 million fireworks a..
Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census.
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
a company wants to check the consistency of electronic copies of signatures for consumer credit purchases. a sample of
If a technical breakthrough occurred that raised the profit per unit of X 1 to $3, would this affect the optimal solution?
Determine the frequencies expected if the two variables, status regarding lab techniques course and laboratory performance, are independent.
alex sells exciting world of statistics videos over the phone to earn some extra cash during the economic crsis. only
If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values,
Analysis of variance- One way classification - Are there differences among these 3 drugs with respect to how long they are retained in the body?
Use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry. Does the jury selection system appear to be fair?
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