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Ten weeks of data on the Commodity Futures Index are 7.35, 7.40, 7.55, 7.56, 7.60, 7.52, 7.52, 7.70, 7.62, and 7.55.
a. Construct a time series plot. What type of pattern exists in the data?
b. Compute the exponential smoothing forecasts for a = .2.
c. Compute the exponential smoothing forecasts for a = .3.
d. Which exponential smoothing constant provides more accurate forecasts based on MSE?
It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is within 2 standard deviations of mean.
Find a 95% confidence interval for the difference in the proportion of deaths between the streptokinase and the control group.
To test whether the significant difference between two proportion test using large sample test.
If two randoom samples of sizes n1 = 30 and n2 = 36 are selected independently from two populations with mean 78 and 85, and with standard deviations 12 and 15, respectively, then the standard error of the difference between Xbar1 and Xbar2 are eq..
Write down the name of 4 parts of the regression equation.
Registration process takes, on average, 2 minutes per patient. Among patients who get prescriptions, average time spent with doctor is 5 minutes. Among those admitted to hospital, average time is 30 minutes.
Test hypothesis that people in State A are more depressed than U.S. population. Illustrate all of your hypothesis steps. (Use alpha = .01.)
Are you doubtful of any of these data points? if so why does there show to be a linear relation between degree of stenosis and nuber of reactive nuclei?
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
Which of the following statements isn't a property of the normal probability distribution? Please explain briefly why
On a graph, the vertical difference between the observed and predicted values of the response variable for an individual is called the
If you select a random sample of 100 sessions, what is the probability that the sample mean is between 7.8 and 8.2 minutes?
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