The graph below shows a scatter plot and a linear model
of Joanna's height, in inches, for various ages. What is the
best interpretation of the y-intercept of the line?
Joanna's Growth
It's likely that Joanna was about 30
inches tall when she was born.
Joanna can expect her height to
increase about 30 inches per year.
Height in Inches
There is no meaningful interpretation of
th Please fill out this field is situation.
It's likely that Joanna was about 30

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.