1) All the U.S. households that owned at least one television set, 83% had two or more sets. A local cable company canvassing the town to promote a new cable service found that of the 300 randomly selected households visited, 240 had two or more television sets. At 0.05, is there sufficient evidence to conclude that the proportion is less than the one in the report?

2) The average one-way airfare from Pittsburgh to Washington D.C., is $236. A random sample of 20 one-way fares during particular month had a mean of $210 with a standard deviation of $43. At 0.02, is there sufficient evidence to conclude a difference from the stated mean?

3) The number of carbohydrates found in a random sample of fast-food entrees is listed. Is there sufficient evidence to conclude that the variance differs from 100? Use the 0.05 level of significance. Data: 53,46,39,39,30,47,38,73,43,41.