You are measuring the heat released in a reaction and obtain the following values (in kJ/mol): 55.2, 53.0, 51.4, 56.3, 54.9, 53.8 Assume that the probability distribution function describing the measurement is a normal distribution function. Answer each of the following:

a. You are told that the standard deviation for measurements with the instrument is 1.1 kJ/mol. Use this information to estimate the 95% confidence interval for the measurement.

b. You are not given any information on the standard deviation for measurements with the instrument. Use the available information to estimate the 95% confidence interval for the measurement.