Discuss the below:
Q: A manufacturing company produces water filters for home refrigerators. The process has typically produced about 4% defective. A recently designed experiment has led to changing the seal to reduce defects. With the process running using the new seal, a random sample of 300 filters yielded 7 defects.
a. Conduct the most appropriate hypothesis test using a 0.10 significance level.
b. Construct a 90% confidence interval for the true proportion of defective water filters.