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A company uses the formula C(x) = 0.02x^2 - 3.4x + 150 to model the unit cost in dollars for producing x stabilizer bars. For what number of bars is the unit cost at its minimum? What is the unit cost at that level of production?
In a study designed to determine patientâ??s acceptance of a new pain reliever, 100 physicians each selected a sample of 25 patients to participate in the study.
A teacher figure that final grades in the statistics department are distributed as A,25%, B, 25%, C, 40%, D, 5%, F, 5%. At the end of the randomly selected semester, the following number grades were recorded.
(a) What is the sample proportion of Americans who believe there is intelligent life on other planets? (b) What is the standard error of the sample proportion? (c) Calculate a 90% CI for the population proportion of Americans who believe there is ..
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Find the minimum sample size required for estimating the overall proportion of students who passed Exam P in 2009 to within 4% with 95% confidence if it is known that this proportion is between 30% and 40%.
Assume that a 95% confidence interval for the mean is 14.5
At a .10 level of significance, use Stat Tools (or Excel) to test the sponsors' hypothesis. State the null and the alternative hypotheses and the decision rule. Finally, discuss your findings.
What is the predicted blood pressure for an average 17 year old as estimated from the regression line? And the standard error of the estimate for a 17year old ?
Form a frequency distribution and a percentage distribution that have class intervals with the upper class limits $99, $119, and so on.
The specification limits are set between 15.8 and 16.2 ounces.
Let X1 and X2 denote the proportion of two different chemicals found in a sample mixture of chemicals and used as an insecticide. Suppose X1 and X2 have the joint probability density function given by:
A random sample of 13 four-cylinder cars is obtained and the breaking distances are measured and found to have a mean of 137.5 ft and a standard deviation of 5.8 ft.
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