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Let et~ WN(0,2). State for each of the following model whether it is stationary and whether it is invertible. Explain your answer.
a) Zt= 1+ 0.5Zt-1 + et, t=1,2.3....
b) Zt= et - 1.5et-1 + 0.5et-2, t=1,2,3,
Farley purchases and pays for merchandise 60% in the month of acquisition and 40% in the following month. Accounts payable is used only for inventory acquisitions. How much cash will Farley receive during November?
Mean daily amount of her tips was $24.85, with a standard deviation of $3.24. Can Ms. Brigden be 99% confident that she is earning an average of $20 or more per day in tips?
A local bakery uses its stock of sugar according to demand for its products. Indeed, the weekly sugar use follows approximately a normal distribution with mean 2,400 lb. and with standard deviation 400lb.
Create the estimated regression equation by calculating the values of b 0 and b 1
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
The NY Dept of Motor Vehicles (DMV) designs its license plates with space for 7 letters or numerals. In the most recent iteration, the DMV uses three letters followed by 4 numbers.
Assume you have the following data Ho mu = 2,450, s = 400, n = 100, and xbar = 2,300. Conduct a hypothesis test at the .01 significance level.
In addition, the average daily balances have been found to be normally distributed (Gaussian). What percentage of personal checking account customers carry average daily balances in excess of $800?
Using a spreadsheet, create a table that shows the relationship among the units of heights of people in centimeters, inches and feet in the range of 150cm to 2m. Use increments of 5cm.
What are the differences between regression and correlation analysis? What is correlation? Does correlation prove causation? Why or why not? Explain and provide examples to support your explanation.
If a recent news report indicated that out of 105 people polled, 65 men and 15 women had given the president a high approval rating, while 15 men and 10 women had given the president a low approval rating. A chi-square test yields these resul..
question let wi be the power received by the mobile at distance i from the base station. the probability distribution
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