1. What is the critical value for the following scenario?

We want to test if the average production capacity of a certain machine is at least 30 units per day. We have observed that machine over the past 25 days. We would like to test at 95% confidence interval.

2. Report the proper critical value:

A milk-producing company claims that their large bottle of milk contains at least 4 liters of milk. A sample of 20 bottles has an average volume of 3.85 liters with a sample standard deviation of 0.65 liters.

Test at 90% confidence level.