The data from an independent-measures research study produce a sample mean difference of 4 points and a pooled variance of 18. if there are n = 4 scores in each sample, what is the estimated standard error for the sample mean difference?

Carmen and matt are conducting different chemistry experiments in school. in both experiments, each student starts with an initial amount of water in a flask. they combine two chemicals which react to produce more water. carmen's experiment starts with 30 milliliters of water in a flask, and the water increases in volume by 8.5 milliliters per second. matt's experiment starts with 10 milliliters of water and increases in volume by 28% each second.