An employee who wanted to describe the strength of materials performed a sample of 14 measurements. He assumed that these were independent measurements all from the same normal distribution (the parameters of which are unknown). He correctly set up the 95% confidence interval for the mean strength and arrived at the interval [113.42; 124.16]. His supervisor looked at the work, but then said she preferred a 99% confidence interval. Enter the lower bound of this 99% confidence interval. Round up to two decimal places.
Please some can help me how I can calculate this question for example how S must be done?