When determine if the data excepted or rejected your hypothesis you are

the null hypothesis is correct until we have enough evidence to suggest otherwise. After you perform a hypothesis test, there are only two possible outcomes. When your p-value is less than or equal to your significance level, you reject the null hypothesis. The data favors the alternative hypothesis.

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"