Given:
Number of cans he bought = 36
mean = 11.29
standard deviation = 0.21
The confidence interval (C.I) can be found using the formula:
The z-score at 95% confidence level is 1.960
Substituting the given values into the formula:
Answer:
Confidence interval : (11.7214, 11.8586)
Is pepsi filling the cans with less than 12 ounces of soda?
From the confidence interval, we can be 95% certian that the population mean lies in the range (11.7214, 11.8586).
Yes, Pepsi is filling cans with less than 12 ounces of soda