In this study 100 groups of five participants were used to discover problems with an interface. The study did indeed find that the mean percentage of problems discovered across all 100 groups was about 85%. However, this figure has 95% confidence level and a margin of error of Â±18.5%.
Keelboats were generally built in Pittsburgh, Pennsylvania and it was here that Meriwether Lewis commissioned the boat used by the Corps of Discovery. The keelboat used by the Corps was sketched by Clark in his journal. It was 55 feet long and 8 feet wide, with a 3- to 4-foot draft. For propulsion it had a 32-foot sailing mast, 22 oars, a rudder, and a tiller for steering. Protection against hostile encounters were a swivel cannon on the bow and two smaller guns called blunderbusses.
This boat is a 1976 18 ft. Landau ALL WELDED jon boat. It is 76 inches at the top and 58 inches at the bottom. It is very stable in all water conditions and the extra wide bottom drafts very little water so you can get in the shallows where the ducks want to be. It has a removable boat seat with a swivel chair. The wide open floor plan is perfect for hunting or fishing.