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Flu cases this past fly season in the Central City school system were about 15 per week. For the entire state, the weekly average is 16 and the standard deviation, 2.35. Are the kids in Central City as sick as the kids throughout the state?
A medical researcher estimates that no more than 55% of U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say they eat breakfast every day.
The standard deviation of the sample was computed to be 2.1 calls. At the .05 level of significance, can we conclude that more than 40 calls are made on the average in a week?
The degree three polynomial f(x) with real coefficients and leading coefficient 1, has -3 and + 4i among its roots. Express f(x) as a product of linear and quadratic polynomials with real coefficients.
Describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field.
What is the half-width (from the middle of the confidence interval to either of the confidence limits) of the 99% confidence interval for the population mean time spent on investment research by portfolio managers?
What is the distinction between distribution-free methods and nonparametric methods?
"Do you believe that gun control laws which restrict the ability of Americans to protect their families should be eliminated?"
Eighteen first interviews are usually scheduled per day. What is the probability that the average length of time for the eighteen interviews will be 40 minutes or longer?
Problem based on combinatory - how many different license plates are possible?
state the hypotheses and identify the claim. compute the test value At a = 0.05, decide if there is enough evidence to reject the claim of no difference in the ages fo the two groups. Compute and use the standard deviations from the samples.
The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations.
Plant B has a standard deviation of 150 model FX32's per day. Which of the plants would you prefer to manage? Explain why you would prefer that particular plant.
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