A cable service company would like to check how the level of customer service they provide affects customers' behavior at the time of renewing their contract. They randomly assigned 1000 customers each to three different tiers of service"gold", "silver" and "bronze". They recorded whether these customers subsequently renewed, upgraded or canceled their contracts at the time of renewing their contracts. What kind of statistical test would you perform to determine whether the level of customer service affected customer behavior? State the null and alternate hypothesis. What statistical test would you perform to determine whether gold service led to higher rates of renewal (includes upgrades) than bronze or silver?