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.
The Catalina 30 is a twenty nine foot 11 inch long fiberglass sailboat first produced in 1974 by the Catalina Yachts Company in California.It is a sloop-rigged boat with a fixed lead keel. It has a beam of 10'10, and a draft of five feet, three inches.The Catalina 30 has been through three revisions:1  Mark I-Produced from 1975 to 1986.t is a sloop-rigged boat with a fixed lead keel. It has a beam of 10'10, and a draft of five feet, three inches. The Catalina 30 has been through three revisions: 1  Mark I-Produced from 1975 to 1986.