The Student Council at Woodlands Middle School is planning a field
trip. They polled randomly selected teachers and students and asked
whether they prefer to go to the aquarium or an amusement park.
The results are shown in the table below.
1 Complete the following sentences.
Aquarium
Amusement
Park
people prefer to go to
the aquarium.
Students
32
Teachers
people prefer to go to
the amusement park

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.