Question: This question refers to dataset below a. Using Minitab to conduct Time Series Plot and Autocorrelation Plot with 13 lags for the original series. (10

This question refers to dataset below a. Using Minitab to conduct Time Series Plot and Autocorrelation Plot with 13 lags for the original series. (10 marks) b. Is this IBM series stationary, based on the Autocorrelation Plot? Use Minitab to conduct data differencing if the series is nonstationary, ACF Plot and Partial ACF Plot for these differenced series. (15 marks) c. Definite p, d, q to propose maximum 2 candidate ARIMA(p,d,q) models for this IBM series, concluded from above plots to briefly explain why. (10 marks)

Period	IBM
Jan. 6	267
13	267
20	268
27	264
Feb. 3	263
10	260
17	256
24	256
Mar. 3	252
10	245
17	243
24	240
31	238
Apr. 7	241
14	244
21	254
28	262
May. 5	261
12	265
19	261
26	261
Jun. 2	257
9	268
16	270
23	266
30	259
Jul. 7	258
14	259
21	268
28	276
Aug. 4	285
11	288
18	295
25	297
Sep. 1	292
8	299
15	294
22	284
29	277
Oct. 6	279
13	287
20	276
27	273
Nov. 3	270
10	264
17	261
24	268
Dec. 1	270
8	276
15	274
22	284
29	304

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