Stimulus  Response
 (x)        (y)      log(y)
 30         0.2       -.70
 50         1.0        .00
 60         3.0        .48
 70         5.0        .70
 75         8.5        .93
 80        10.0       1.00
 85        14.0       1.15
 90        20.0       1.30
 95        29.0       1.46
 100       43.0       1.63