Question

For a project for her statistics class, Justine tested the dry strength of three brands of paper towel. Getting a random sample of towels from each brand is next to impossible on a student's budget, but she thought it was reasonable to assume that all the rolls of towels of the same brand are pretty much identical. So Justine bought one roll of each of the three brands and used the first 25 towels from each. With the help of two friends, she stretched each towel tightly and dropped a golf ball on it from a height of 12 in and recorded whether the golf ball went through the towel. Justine teste

Answer 1

the 75 towels in random order because she realized it would be impossible to hold her testing procedure completely constant.
a) Assume the probability the towel will break is the same for each brand, construct a table of expected frequencies.