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A metropolitan school system consists of two districts-north and south. The north district contains 60% of all students, and the south district contains 40% of all students. A minimum competency test was given to all students. 10% of the north district students failed, and 15% of the south district students failed. What is the probability that a student who has failed the test came from the South District?
a) 0.15
b) 0.40
c) 0.50
d) 0.75
The ANOVA summary table below is the result of a regression of sales on year of sales. Is the relationship statistically significant at .05? Comment.
In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
If p is the probability of Event 1 and (1-p) is the probability of Event 2, based on the expected returns, for what values of p would you select A? B? C? Values in the table are payoffs.
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
Below are one hundred pseudorandom numbers from a uniform pdf. Set up and test the appropriate goodness-of-fit hypothesis. Let α = 0.05.
According to the patient's history and physical examination. What are the chances of herniation if the MRI is positive?
Be sure to include information about how you would use the concept of probabilities to apply to profiles for hiring more satisfied individuals.
What happens to the expected return and standard deviation of returns of the portfolio in Part a if the following conditions exist?
Generate descriptive statistics. Create a stem-and-leaf plot of the data and box plot of the data.
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