Question: Gigi's Pizza regularly surveys its customers. On the basis of these surveys, the management of the chain claims that at least 75% of its customers rate the food as excellent. A consumer testing service wants to examine the claim by asking 460 customers to rate the food. Seventy one per cent rated the food as excellent. Is there enough evidence at the (a) 5% and (b) 1% level of significance to reject management's claim?