Cosmetic surgery study. Data files cosmetic_surgery.sav (spss file) and cosmetic_surgery.xlsx (excel data file) contain data from a hypothetical study of quality of life of cosmetic surgery patients, Base_QOL (quality of life score at baseline with higher score indicating greater perceived QOL), and Post_QOL (QOL score at followup). Coding for categorical variables is the following: Surgery

0=waiting list 1=surgery

Questions:

1. Is there a significant difference between the Base Quality-of-Life (Base_QOL) score and Post Quality-of-Life (Post_QOL) score in patients who underwent cosmetic surgery?

2. Perform a paired t test to see the difference in scores before and after surgery.

ID	Post_QoL	Base_QoL	Surgery
9	61.5	80.0	1
18	61.1	73.0	1
19	56.0	66.0	1
20	63.0	61.0	1
27	72.0	73.0	1
35	68.3	72.0	1
36	65.0	73.0	1
37	70.7	70.0	1
38	67.0	76.0	1
50	73.9	71.0	1
51	58.0	79.0	1
52	57.0	63.0	1
53	60.0	62.0	1
54	52.0	65.0	1
55	53.0	57.0	1
56	54.4	58.0	1
57	56.0	59.0	1
58	52.0	61.0	1
59	66.0	57.0	1
60	58.0	71.0	1
61	55.0	63.0	1
69	57.0	71.0	1
70	51.0	62.0	1
71	56.0	56.0	1
72	64.0	61.0	1
73	58.0	69.0	1
74	53.0	63.0	1
75	57.3	58.0	1
76	59.0	62.0	1
77	61.0	64.0	1
89	64.7	58.0	1
90	67.0	70.0	1
96	60.2	74.0	1
97	53.0	65.0	1
98	51.0	58.0	1
100	51.0	65.0	1
101	54.0	56.0	1
104	54.0	55.0	1
108	60.4	56.0	1
109	64.0	65.0	1
110	61.0	69.0	1
112	55.0	61.0	1
113	55.0	60.0	1
115	64.0	75.0	1
116	66.0	69.0	1
118	52.0	72.0	1
119	52.0	57.0	1
120	49.0	57.0	1
122	59.0	70.0	1
123	53.0	64.0	1
125	59.0	77.0	1
126	57.0	64.0	1
131	69.0	76.0	1
132	64.0	74.0	1
136	68.5	61.0	1
137	54.0	74.0	1
138	71.8	59.0	1
139	65.0	77.0	1
140	67.0	70.0	1
141	70.4	72.0	1
142	62.0	75.0	1
143	64.0	67.0	1
144	63.0	69.0	1
145	53.0	68.0	1
146	55.0	58.0	1
150	67.4	57.0	1
151	57.0	72.0	1
152	58.0	62.0	1
156	62.4	65.0	1
157	59.0	67.0	1
158	63.0	64.0	1
162	62.0	53.0	1
163	68.0	67.0	1
164	73.0	73.0	1
165	60.6	78.0	1
166	59.0	66.0	1
167	60.0	64.0	1
168	63.9	65.0	1
169	56.0	69.0	1
173	49.8	53.0	1
174	52.0	55.0	1
175	55.0	57.0	1
176	63.8	60.0	1
177	53.0	69.0	1
178	47.0	58.0	1
190	53.0	53.0	1
191	56.7	58.0	1
192	48.0	62.0	1
193	48.0	53.0	1
194	56.8	53.0	1
195	53.0	62.0	1
196	56.0	58.0	1
197	66.8	61.0	1
198	51.0	72.0	1
199	53.0	56.0	1
200	61.7	58.0	1
201	51.0	67.0	1
202	54.0	56.0	1
203	63.6	59.0	1
204	60.0	69.0	1
205	59.0	65.0	1
216	47.0	65.0	1
217	49.0	52.0	1
218	63.8	54.0	1
219	53.0	69.0	1
220	58.0	58.0	1
227	57.1	57.0	1
228	65.0	62.0	1
229	66.0	70.0	1
230	68.4	71.0	1
231	58.0	73.0	1
232	62.0	63.0	1
234	46.0	59.0	1
235	50.0	51.0	1
236	67.1	55.0	1
237	60.0	72.0	1
238	67.0	65.0	1
240	68.0	68.0	1
241	68.0	73.0	1
242	66.7	73.0	1
249	62.7	56.0	1
250	57.0	68.0	1
251	57.0	62.0	1
258	73.9	59.0	1
259	57.8	79.0	1
260	52.0	63.0	1
261	60.0	57.0	1
270	53.0	63.0	1
271	66.3	58.0	1
272	55.0	71.0	1
273	64.0	60.0	1