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Refer to given Exercise. Construct an exponentially weighted moving-average chart using a weighting constant of 0.2 for the weekly amount invested. Comment on the process. If it is desired to have a goal value of $1.5M for the standard deviation, using the constructed chart, comment on the ability of the process to achieve this goal.
Exercise An investment bank is interested in monitoring the weekly amount (in millions of dollars) invested in volatile stocks so as to maintain a stable rate of return on a selected fund. Table 7-31 shows 25 consecutive weeks of the amount invested ($M) in the fund. Construct appropriate control charts and comment on the stability of investment. Revise the chart, if necessary, assuming special causes for out-of-control points. What is your estimate of the standard deviation of the weekly amount invested?
Suppose you have a tree farm and you have 1000 live oaks on this farm. You are wondering if this would be a profitable time to harvest the tallest ones - those over 55 feet tall.
Two independent samples of a random variable X are taken. - Determine the expected value and variance of the sample mean.
If x , the number of successes in the first set, is 60 and y , the number of successes in the second set, is 48, what P-value would be associated with the data?
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
Fit a straight line to each of the data sets giving least squares estimates, ANOVA table, and R squared. Compute the correlation coefficient between y and x for each data set. Comment on your results. Would a linear regression of y on x be appropr..
Perform a hypothesis test by using.04 level of significance to find out if there is a difference between the population means.
several Measures of Central Tendency (averages). We usually use the mean. Where would we use other measures, such as the mode or the median?
given that z is a standard not a standard normal random variable find z for each situationa. the area tot he left of z
What happens to the confidence interval when we go from a 95% confidence level to a 99% confidence level? Is this desirable? When would we want to use a 99% confidence interval?
in each of the following situations the sampling frame does not match the population resulting in undercoverage. give
Let the random variable x represent the number that are not correctly calibrated. Find the mean and standard deviation for the random variable x.
the table below represents the total number of patients who were readmitted to critical hospital within 30 days of
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