Use the given degree of confidence and sample data to construct a confidence interval for the population mean
μ.
Assume that the population has a normal distribution.
Thirty randomly selected students took the calculus final. If the sample mean was
90
and the standard deviation was
14.8,
construct a 99% confidence interval for the mean score of all students. Round to two decimal places.
A.
85.41<μ<94.59
B.
82.55<μ<97.45
C.
83.35<μ<96.65
D.
82.58<μ<97.42
μ.
Assume that the population has a normal distribution.
Thirty randomly selected students took the calculus final. If the sample mean was
90
and the standard deviation was
14.8,
construct a 99% confidence interval for the mean score of all students. Round to two decimal places.
A.
85.41<μ<94.59
B.
82.55<μ<97.45
C.
83.35<μ<96.65
D.
82.58<μ<97.42
