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Lizard Evolution Virtual Lap Calculating SEM and 95% CI So, calculating the SEM and, more importantly, the are of the population means. Calculate the SEM and 95% CI rounded to three d instructions for calculating SEM and 95% Cl using Iron Cay Individual Relative Hindlimb Calculations Length 0.33 2 1.42 Sample Mean 3 1.4 0.874 4 1.86 Sample SD 0.499 0.59 6 0.65 Standard Error (SEM) 0.63 8 0.61 95% CI (2 x SEM) 9 0.53 10 0.72 ack