c $)$ Hypothesis testing is a process for choosing between different

alternatives which have to be mutually exclusive and exhaustive. Based on

the following tase, develop the research hypotheses for testing:

Case: An electric bulb manufacturing company wants to launch a newly

developed bulb. Before taking it to the market the quality assurance

department of the company is entrusted with the responsibility to ensure

the quality. For ensuring the quality the department has to conduct

research. The department may claim that the average life of its bulbs is at

least $1000$ hours.

Required: You have to find out the alternatives, which have to be

mutually exclusive and exhaustive.