The change in fuel remaining from one row to the next in the table is gallon(s).

The change in distance from one row to the next in the table is
mile(s).

The slope of the line that runs through the points given in the table is
.

The slope indicates a
.

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.