Astronauts increased in height by an average of approximately 40 mm (about an inch and a half) during the Apollo–Soyuz missions, due to the absence of gravity compressing their spines during their time in space. Does something similar happen here on Earth? An experiment supported by NASA measured the heights of six men immediately before going to bed, and then again after three days of bed rest (Styf et al. 1997). On average, they increased in height by 14 mm, with standard deviation 0.66 mm. Find the 95% confidence interval for the change in height after three days of bed rest.