Question

determine whether each method results in a random sample of bikes from the shop.
random not random
check all bikes that are more than 3 years old.
write the id numbers on slips of paper and choose 20 slips of paper without looking.

Explanation:

• For "Check all bikes that are more than 3 years old": This method is not random because it only focuses on a specific subset (bikes older than 3 years) and not all bikes in the shop have an equal chance of being selected.
• For "Write the ID numbers on slips of paper and choose 20 slips of paper without looking": This is a random sampling method as each bike (represented by its ID) has an equal probability of being chosen when the slips are selected without bias.

Answer:

• Check all bikes that are more than 3 years old: Not Random
• Write the ID numbers on slips of paper and choose 20 slips of paper without looking: Random