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A poll showed that 48 out of 120 randomly chosen graduates of California medical schools last year intended to specialize in family practice. What is the width of a 90% confidence interval for the proportion that plan to specialize in family practice.
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
It is believed that students who begin studying for final exams a week before the test score differently than students who wait until the night before. Suppose you want to test specifically that students who study earlier have an average score tha..
A sample of 93 IQ scores was randomly selected from a certain population. At the 0.03 level of significance, test the hypothesis that the population has a mean IQ of 105.
Is contamination with the two kinds of bacteria disjoint? Explain. (c) Is contamination with the two kinds of bacteria independent? Explain.
The singer has the following variety of songs, in no particular order: 7 relationship songs, 6 songs about people, 4 reflective songs, and 4 songs about places.
Caculate the expected value of the profit made by the insurance company. Many call this kind of situation a win win opportunity for the insurance company and the promoter. Do you agree? Explain.
That a sample of 40 females gives an average production which is more than that based on a sample of 36 males by more than 6 items, assuming sampling with replacement, and that, the sample size for the two sexes being the same, the average product..
The diameters of ball bearings are distributed normally. The mean diameter is 74 millimeters and the variance is 16. Find the probability that the diameter of a selected bearing is less than 78 millimeters.
A TV spot in the Channel 22 early news costs $1500. The average quarter hour Adult 25-54 audience is 15,000. What is the CPM?
Simplify a product of radical expressions. Assume that all variables represent positive real numbers
Find the expected GPA when SAT = 800. Find E (GPA|SAT = 1,400). Comment on the difference.
The standard error of the estimate can be used to determine a range within which the independent X variables can be predicted with varying degrees of statistical confidence based on the regression coefficients and the value for the Y variable.
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