Crop researchers plant 15 plots with a new variety of corn. the yields in bushels per acre are: 138.0 139.1 113.0 132.5 140.7 109.7 118.9 134.8 109.6 127.3 115.6 130.4 130.2 111.7 105.5 assume that math notation bushels per acre.
a) find the 90% confidence interval for the mean yield for this variety of corn.
b) find the 95% confidence interval.
c) find the 99% confidence interval.
d) how do the margins of error in (a), (b), and (c) change as the confidence level increases?

i believe the correct answer is b.

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.