Question 4 In a laboratory work, values of voltage drop on a circuit load were recorded as 10.9, 11.0, 10.5, 11.0, 10.9, 11.0, 10.8, 9.7, 10.5, 11.0. The variance of the voltage is 4. Calculate the one-sided 97% confidence interval ( ] -co, ?.??[ ) for the mean value of the DC voltage. (Enter the numerical answer that you would replace the question marks with.)