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.
Other Biggest Boats in the World. In 2010, the biggest yacht in the world was launched. She is named the Eclipse and is 557 feet or 170 meters long. The owner is Roman Abramovich, the designer was Terence Disdale, and the builder was Blohm + Voss in Hamburg, Germany. She has diesel propulsion, can cruise at 22 knots, and her top speed is 25 knots.