You have developed a nutrient cocktail which you believe reduces leaf yellowing under bright light

for the houseplant Epipremnum aureum. You give this cocktail to a random sample of 30 E. aureum plants,

and leave them with 30 control E. aureum in identical conditions in the greenhouse. After a week, you

record the percentage of E. aureum plants in each group with yellowed leaves, and want to test whether your

cocktail was effective. You need a test of:

(a) Unpaired means

(b) One sample proportion

(c) Paired means

(d) One sample mean

(e) Two sample proportion