In a test of physical fitness, a fitness trainer for a group of men ages 65 and older from a local retirement community told a sample of 16 men to do as many sit-ups as they could. It is known the population mean for sit-ups in this age range is 20. The average sit-ups for this sample is 24.5 and the sample standard deviation is 7.916. Complete the steps to make a 95% conclusion and calculate the confidence interval/effect size as appropriate.