Previously, the manager measured that the machine effectiveness was at 67.3% with a sample of size of 9. The team has made some improvements by reducing the time of changeovers, major stops and speed loss. Since those improvements, the manager has measured a rate of effectiveness at 78.2% with a sample size of 12. The goal was to increase effectiveness by 10%. It seems that the goal is achieved. Perform an A/B testing to check if the goal is achieved. Write precisely under which hypothesis you construct the test.
Could you help me to construct the Null and Alternative Hypotheses?
Could you help me to construct the Null and Alternative Hypotheses?