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1. Suppose the proportion of rural voters in a certain state who favor a particular gubernatorial candidate is .45 and the proportion of suburban and urban voters favoring the candidate is .60. If a sample of 200 rural voters and 300 urban and suburban voters is obtained, what is the approximate probability that at least 250 of these voters favor this candidate?
2. Let m denote the true pH of a chemical compound. A sequence of n independent sample pH determinations will be made. Suppose each sample pH is a random variable with expected value m and standard deviation .1. How many determinations are required if we wish the probability that the sample average is within .02 of the true pH to be at least .95? What theorem justifies your probability calculation?
For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
let x be the discrete r.v. with the following probability distribution.a calculate ex.b calculate micro.c calculate
Given the points x={xo, x1, x2,.... xn}^T and the function values f={fo, f1, f2, ....fn}^T at those points, we want to generate a 7th degree spline, i.e. a piecewise 7th degree polynomial approximation.
What is the probability that the mean duration of these patients pregnancies will be less than 258 days?
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Construct a scatterplot and identify the mathematical model that best fits the given data. Assume that the model is to be used only for the scope of the given gata, and consider only linear, polynomial (degree 2) logarithmic, exponential, and powe..
for a component a you have the following failure time data days 28 112 15 8 27 21 22 48 28 73.a suppose you have reason
Assume that, among residents of a large Florida subdivision, the population mean age is 65 years old, the population standard deviation is 2 years, and that the age variable is distributed normally.
Age 65+ Years Sample Size Mean Pain Score Standard Deviation of Pain Score New Medication 20 40.33 2.16 Standard Medication 35 59.80 2.49 Total: Age 65+ 55 52.72 9.74 1. Is there a statistically significant difference in mean pain scores between p..
Why are estimations and confidence intervals important? Do confidence intervals and estimation play a role in the selection of sample size?
On the basis of these results, do you think retailers and consumers have a right to complain to the manufacturers? Why?
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