There are 80 people in Ms. Peterson's classes. One-fourth of the students are going on a field trip. Of those students, one-half
are bringing their lunch. How many students are going on the field trip and bringing their lunch? A. 10 students
B. 20 students
C. 30 Students
D. 15 Students
Where is the mean consumption of milk, is the sample mean, is the population standard deviation, is the size of the sample, is 5% and is the z-value that let a probability of on the right tail.
So, replacing by 3.4 liters, by 1.3 liters, n by 650 and by 1.96, we get that the 95% confidence interval is equal to: