Ahmad Syukri

Suppose that you are in charge to see if dropping an iPhone 5 will damage it. You want to find the proportion of iPhone 5 that breaks. If you want a 95% confidence interval for this proportion, with a margin of error of 5%, how many iPhone 5 should you dr...

A Toyota dealer wants to find out the age of their customers (for advertising purposes). They want the margin of error to be 3 years old. Suppose the sigma is 13 years old. If they want a 90% confidence interval, how many people do they need to know about...