Question 1157128
This is a paired t-test looking at the differences with the null hypothesis difference of 0 or negative, and alternative hypothesis being difference positive (defining difference as before-after)

x bar is 3.125
s is 2.91
n=8 df=7
critical value if alpha is 0.05 for a right tail test is t>1.895

t=(x bar-mean)/s/sqrt(n)
=3.125*sqrt(8)/2.91=3.04
p=0.009

Conclude that hypnotism is effective in alleviating the pain.