(Requires StatTools) Run a regression of Y versus X1, X3, and the interaction between X1 and X3, using dummy variables as necessary. Which of the following is true?

Y	X1	X2	X3
199	71	140	Maybe
186	59	154	Yes
200	62	130	No
210	66	112	No
211	88	151	No
193	70	131	Yes
196	59	159	No
213	86	132	No
193	64	136	Maybe
196	60	112	Yes
195	63	153	Yes
196	79	137	Yes
205	76	122	Maybe
214	78	98	No
194	63	147	Maybe
199	62	140	No
204	67	121	No
194	58	149	Maybe
194	68	133	Yes
184	58	174	Yes
197	61	106	Yes
208	92	148	No
199	59	107	Yes
189	57	145	Maybe
193	65	157	Maybe
190	57	159	Maybe
212	72	102	No
195	60	128	Yes
200	62	127	Yes
190	59	154	Maybe
202	82	118	Maybe
202	63	129	Maybe
207	84	95	Maybe
203	85	123	Maybe
201	68	143	Maybe
207	74	142	No
201	75	138	No
194	63	150	Maybe
192	59	139	Yes
205	72	117	No
191	60	169	Maybe
206	69	91	Yes
188	57	150	Yes
201	58	100	Maybe
215	80	103	No
216	90	116	No
198	66	115	Maybe
197	58	136	No
198	70	136	Yes
197	58	105	Yes
200	75	146	Maybe
192	60	141	Maybe
203	65	96	Maybe
198	83	124	Yes
193	69	145	Maybe
199	77	143	No
195	79	154	Maybe
196	61	139	No
197	67	129	Yes
200	73	124	Yes
187	61	156	Yes
190	62	138	Yes
191	59	141	Yes
202	66	144	No
204	60	125	No
198	64	152	No
211	61	110	No
188	64	167	Yes
205	100	121	Yes
207	70	108	Maybe
195	64	113	Yes
208	73	110	No
210	81	116	No
206	72	127	No
223	77	84	No
206	65	134	No
191	65	164	Yes
187	58	165	Yes
193	65	162	Maybe
189	63	133	Yes
199	61	104	Maybe
187	60	161	Yes
208	74	124	No
212	67	89	No
197	58	119	Maybe
203	71	119	Maybe
202	68	126	Maybe
201	66	148	No
204	71	132	No
192	69	149	Yes
190	59	166	No
209	76	146	No
204	73	129	Maybe
192	61	158	Maybe
203	67	114	Maybe
195	62	132	Maybe
195	58	135	Yes
191	62	161	Yes
198	63	120	Maybe
189	68	155	Yes

a. If X1 decreases by 10 units and X3 is Maybe, Y is expected to decrease by about 4.82.

b. If X1 decreases by 10 units and X3 is Yes, Y is expected to decrease by about 3.33.

c. If X1 decreases by 10 units and X3 is No, Y is expected to decrease by about 4.29.

d. None of these choices are true.