A rancher's herd of 250 sheep grazes over a 40-acre pasture. He would like to find out how many sheep are grazing on
each acre of the pasture at any given time, so he has some images of the pasture taken by the state department of
agriculture's aerial photography division. Here are three samples of the images.
Sample 1 4
Sample 2 1
Sample 3 9
What margin of error is reasonable for these samples?

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

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.