Let = 0.2−1 + be an autoregressive process of order 1, where is a white noise

with mean zero and variance 2.

a) Use Backward Shift operator to express it in terms of

b) Show that the process is stationary

c) Find the ACF

d) Obtain the correlogram

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

Answer for 10 points show work you guys in advanced < 3