The critical value is used to compute the margin of error. (Margin of error = Critical value x Standard deviation of the statistic or <span>Margin of error = Critical value x Standard error of the statistic). If the statistic has normal sampling distribution, then the t</span><span>he critical value can be expressed as a </span>t score<span> or as a </span>z score<span>. </span><span>α = 1 - (confidence level / 100) </span><span>α = 1 - (93 / 100)=1-0.93=0.07 </span>The critical probability is: <span>pc= 1 - α/2 pc=1-0.035=0.965 The critical value is 1.81.</span>
