Question

determine whether each method results in a random sample of bikes from the shop. check all bikes that are more than 3 years old.

Explanation:

A random sample should give every bike an equal chance of being selected. Checking only bikes more than 3 years old means bikes less than or equal to 3 years old have no chance of being selected. This violates the principle of random sampling where all elements in the population (all bikes in the shop) should have an equal probability of being chosen.

Answer:

Not Random