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Derive the variance-covariance matrix for the weighted least squares estimators when the variance-covariance matrix of the observations where W is given in (11.7) and k is a proportionality constant.
Assuming the sigma of 200 was actually the standard deviation for the sample, recalculate the interval estimate. Discuss how this changed your result from that in part b.
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
A life insurance policy has determined that each week an average of seven claims is filed in its Nashville branch. What is the probablity that durning the next week exactly seven claims will be filed?
what is the probability of the event's complement?
determine the null and alternative hypotheses b explain what it would mean to make a type i error and c explain what it
it is estimated that 3 of the athletes competing in a large tournament are users of an illegal drug to enhance
Mr. price Home analyzed the value of purchase made on credit by a sample of 25 credit card customers. The simple mean was found to be R170.08 with a sample standard deviation of R21.90. Assume purchase values are normally distributed.
A teacher claims that the variance on a calculus test is 68. A sample of 28 students had a standard deviation of 5.8. Test the teacher's claim at the 0.05 level of significance.
An experiment is conducted comparing the effectiveness of a new method of teaching algebra for eighth-grade students. Twelve gifted and 12 regular students are taught using this method. Their scores on a ?nal exam are shown in the following table.
a client gives you a data set of 30 observed values that represent the number of gallons of gas that 30 individual
The deadly Ebola virus is a threat to both people and gorillas in Central Africa. An outbreak in 2002 and 2003 killed 91 of 95 gorillas in seven home ranges in the Congo. Find the correlation r between distance and time. Find the regression equati..
Explain why you would choose these two? What did you learn about correlation and causation while completing the course? Differentiate between correlation and causation.
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