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Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves. A customer orders 5 stainless steel valves . What is the probability that one or more will be regular steel? What distribution will be used? What are the parameters? Represent the question as a probability statement? Calculate the probability?
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
State the quick rule for a significant correlation and explain its limitations. What sums are needed to calculate a correlation coefficient? What are the two ways of testing a correlation coefficient for significance?
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
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).
Would it be sensible to conclude that more than 10% of applicants are now failing the test?
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
A random sample of 15 customers is selected, and the results are as follows: 8.02 4.08 5.79 8.73 5.47 5.64 8.01 10.49 8.35 5.9 9.66 9.91 3.82 6.68 6.17 a) calculate arithmetic mean, median, mode, first quartile and third quartile.
The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviat..
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter.
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