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Show that S^2subp is an unbiased estimator of (sigma)^2 and find its variance under the condition of following theorem. If xbar1,xbar2, s1, and s2 are the values of the means and the standard deviations of independent random samples of sizes n1 and n2 from normal population with equal variances , then (xbar1-xbar2)-talpha/2,n1+n2-2*ssubp sqrt(1/n1+1/n2)<Mu1-Mu2 < (xbar1-xbar2)+talpha/2,n1+n2-2*ssubp sqrt(1/n1+1/n2) is a (1-alpha)100% confidence interval for the difference between the two population means.
Assuming a linear relationship between sales and years of experience f a salesperson, asc the least-squares method to find the regression coefficients. b0 and b1.
a manufacturer of clothing knows that the probability of snap flaws is 0.005. an inspector examines 50 shirts in an
If random samples, each with n = 9 scores, are selected from a normal population with µ = 80 and σ = 36, then what is the expected value for the distribution of sample means?
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states.
a pharmaceutical company is checking their medicines according to the regulations imposed. the company must ensure that
A psychology professor is interested in whether implementing weekly quizzes improves student learning. She decides to use the weekly quizzes in one section of her introductory psychology class and not to use them in another section of the same cou..
The foreman at a large plant estimates defective parts about 1.5% of the time. If the plant produces 25,000 parts in a week, what is the standard deviation (to the nearest tenth) for the number of defective parts?
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
The manufacturer of Feel Better aspirin advertises that 60% of pediatricians recommend Feel Better for children under twelve. Safe and Sound, a rival manufacturer
A Geiger-Muller tube and a scaler record approximately 50 counts per second due to a radioactive source. What is the shortest counting time required so that the percentage error of the counts will not exceed 1%?
Does your analysis change if the term "average" refers to the mean? To the median? Explain what effect this misinformation might have on the perception of the nation's schools.
Following data represent concentration of dissolved organic carbon (mg/L) collected from 20 samples of organic soil. Sample standard deviation is?
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