Reference no: EM131880616

A machine cuts plastic into sheets that are 30 feet (360 inches) long. Assume that the population of lengths is normally distributed.. Complete part (a) and (b)

The company wants to estimate the mean length the machine is cutting the plastic with in 0.25 inch. Determine the minimum sample size required to construct a 95 % confidence.

a Assume the population standard deviation is 0.50 inch

n=___, round up to nearest whole number

repeat part (a)using an error tolerance of 0.125 inch

n=___

Which error tolerance requires a larger sample size? explain

a. tolerance E = 0.125 requires a larger sample size, As error size decreases, a larger sample must be taken to ensure the desired accuracy.

b. tolerance E = 0.125 inch requires a larger sample size. As error size increases a larger sample must be taken to ensure the desired accuracy

c. tolerance E = 0.25 inch requires a larger sample size. As error size increases a larger sample must be taken to ensure the desired accuracy

d. tolerance E = o.25 inch requires a larger sample size. As size decreases a larger sample size must be taken to ensure the desired accuracy