Im having a hard time understanding thehypothesistesting for z test and p value for one tailed test. I went on course hero to find clearer examples and I couldn't find any to help me learn this properly with step by step clear instructions. As you can see down below, the practice question ask I tried to understand and I would like to learn how

Think of an application where you can use hypothesis testing to test a premises. Use .05 for your alpha and give the scenario. Set up the problem, solve it and state the conclusions. im not sure if my scenario make sense

For my scenario let say a shop has average daily selling of $ 75. shopkeeper claims that average daily selling of shop has greater than its average of $ 75.to support this claim, he collects a sample of 25 days and finds that average daily selling is $80. standard deviation is $9.use significance level of 5%