The mean life of 100 bulbs produced by a company is computed to be 1570 hours with standard deviation of 120hours. The company claims that the average life of bulbs produced is 1600 hours. At 5% level of significance, use the sub questions below to determine if the company's claim is acceptable.

Differentiate between null and alternative hypothesis, aid your answer with an example in each case, including their scientific notations ii. Explain what a hypothesis is? iii. State the null and alternative hypothesis for the above case study? iv. Compute the standard error v. Compute the Z-value vi. Determine the tabulated Z value at 5% confidence level.