The data represents the costs of nine compact refrigerators rated very good or excellent by Consumer Reports on their website.
The lengths of the products produced in a production process are controlled. The standard deviation is 0.45 mm. A quality control specialist keeps checking over 40 units randomly every morning. Average length in one day 35.62mm. when it happens; Which of the following is the confidence interval for the mean population mean at
A)
B)
C)
D)
E)