two sided test)
_______________________________________________________________
    75.000               3               4
    90.000               7               9
    95.000              11              13
    99.000              20              22
    99.900              35              37
    99.990              50              53
    99.999              66              68
</pre>
<p>
            So in this case, many more measurements would have had to be made, for
            example at the 95% level,