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Let Xt=1+e t- 0.5et-1 , t=1,2,3,...., where et~llD(0,2),the variance of et is 2. a) Compute the mean of Xt b) Compute the variance of Xt c) Find the correlation between Xt and et-1
Develop a regression model to predict Costsbased on the Level of Productionand compare it to the dispersion obtained from the table above.
Find the standardized test statistic to test the claim that mean1 = mean 2. Two samples are randomlu selected from each population. The sample statistics are given below.
As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test value?
Samples t test and one that would require a dependent samples t test. And explain what they mean and why they are independent or dependent samples.
Explain how a matched pairs experiment should be conducted to compare left- and right-hand gripping strenghts. Be sure to explain the role of randomization, and why it is important in this experiment.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Calculate appropriate summary statistics. Incorporate these graphs and statistics into a well written summary. How could you apply statistical critical thinking in this situation?
You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
At the .01 signficance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
Identify whether the following variables are numerical or categorical if numerical state whether the variable is discrete or continuous. if categorical state, whether the variable is nominal or ordinal.
Consumer Reports magazine tested paints. The table below shows the overall quality score and cost in dolllars per gallon. Test for a correlation. Based on these results, do you get better quality paint by paying more?
Perform the chisquare test for a uniform distribution. At α = .05, does this sample contradict the assumption that sales are the same for each beverage?
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