In a study of water pollution, a sample of mussels was taken and lead concentration (milligrams per gram dry weight) was measured from each one. The following data were obtained: {111, 99, 103,95,88,86,111,100,97,107,100,109,94,103,110,93}.

Calculate the upper bound of the 95% confidence interval of the mean. Provide the answer in 3 decimal places. You may use JASP to calculate the measure, S.E. mean, and apply it to the formula of the 95% confidence interval for small sizes, i.e. UB = x + taf . SE(x) Note: df = n - 1