A psychologist conducted a survey of the attitude towards the sustainability of American energy consumption with 350 randomly selected individuals several years ago. The psychologist believes that these attitudes have changed over time. To test this he randomly selects 350
individuals and asks them the same questions. Can the psychologist confirm his theory that the attitudes have changed from the first survey to the
second survey?
Attitude
1st Survey
43%
2nd Survey
46%
Optimistic

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Hannah paid $3.20 for 16 ounces of potato chips. hank paid $3.23 for 17 ounces of potato chips. who paid less per ounces?

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?