Average Insert = Mean ± tα/2× std. error of mean
Ratio = Proportion ± tα/2× std. error of proportion
Where,
std. error of mean = s/√n
std. error of proportion = √(p(1-p)/n
s = Standard Deviation
p = Proportion i.e True positives/Total positives
n = sample size
α = 1 - (Confidence Level/100)
t
α/2 = t-table value