Find the mean and standard deviation.
Hypersexual behaviour caused by traumatic brain injury (TBI) is often treated with the drug Depo-Provera. In one clinical study, eight young male TBI patients who exhibited hypersexual behaviour were treated weekly with 400 mgs of Depo-Provera for six months. The testosterone levels [in ng/DL] prior to treatment and at the end of the 6-month treatment period are given in the table below.
|
Patient
|
Pre-Treatment
|
After 6 months on Depo-Provera
|
|
1
2
3
4
5
6
7
8
|
849
903
890
1,092
362
900
1,006
672
|
96
41
31
124
46
53
113
174
|
Form the column of differences and find out the mean and standard deviation of this column of numbers.