Length of ears of corn a particular seed will produce 99 con
Solution
Note that
Margin of Error E = z(alpha/2) * s / sqrt(n)
Lower Bound = X - z(alpha/2) * s / sqrt(n)
Upper Bound = X + z(alpha/2) * s / sqrt(n)
where
alpha/2 = (1 - confidence level)/2 = 0.005
X = sample mean = 12.5
z(alpha/2) = critical z for the confidence interval = 2.575829304
s = sample standard deviation = 0.7
n = sample size = 32
Thus,
Margin of Error E = 0.318742614
Lower bound = 12.18125739
Upper bound = 12.81874261
Thus, the confidence interval is
( 12.18125739 , 12.81874261 ) [ANSWER]
