Answer only b and c

An experiment was conducted to compare three popcorn brands and investigate if the yield (in cups of popped popcorn from % cup of popcorn) of their popcorn is different. The brands are X, Y, and Z. The obtained data are as follows: (15 marks) Popcorn yield (cups) X 4.5 4.5 4 5 5.5 5 Y 5.5 5.5 6 6.5 7 7 Z 3.5 4 3 4 5 4.5 a) What type of experiment design is this? Break down the details and parameters of this experiment's design. You must list the parameters and mention the quantity or quality of each? b) What assumptions should be made in analysing the outcome of this experiment? c) Does popcorn brand make significant difference in popcorn yield, at 5% significance level