Find the critical value zα/2 that corresponds to a 93% confidence level.

The critical value is used to compute the margin of error. (Margin of error = Critical value x Standard deviation of the statistic or Margin of error = Critical value x Standard error of the statistic).

If the statistic has normal sampling distribution, then the t he critical value can be expressed as a t score or as a z score.

α = 1 - (confidence level / 100)

α = 1 - (93 / 100) = 1-0.93=0.07

The critical probability is: pc = 1 - α/2 pc=1-0.035=0.965

The critical value is 1.81.