Construct an 80% confidence interval to estimate the population mean using the data below.
x=21
$=5.6
n=18
What assumptions need to be made about this population?
The 80% confidence interval for the population mean is from a lower limit of ☐ to an upper limit of ☐
(Round to two decimal places as needed.)
What assumptions need to be made about this population?
OA. The population size is larger than 30.
OB. The population follows the normal probability distribution.
OC. The population follows the Student's t-distribution.
OD. The population distribution is skewed to one side.
