the age ( in years) of 20 randomly sampled dogs shown in the table below 4 2 7 1 0.5 3 11 6 8 3 1 4.5 5 3 9 10 8 2 0.5 4 Using excel, construct a 80% confidence interval using a t- distribution for the mean age 80% confidence interval _________ +/- _________________ Solution The 80% confidence interval is from 3.65711 to 5.59289..