Hi there I feel confused about the difference between statistical test and confidence interval For example, the questions below I found on practice problems gives only answer but no explanation indicate a) whether the researchers should use a statistical test or confidence interval, and b) what the population parameter(s) of interest is/are.

1. Surveying 291 school districts across the US to determine the proportion which have introduced weekend meals since the beginning of the pandemic.

1. Testing 87,524 non-first generation and 25,954 first generation college students at Penn State on the same academic distress assessment to determine if there is evidence for the claim that first generation college students score higher (indicating higher distress), on the average.

1. Conduct an experiment with 23 university students in a clinical setting to find the mean number of days to full recovery from mononucleosis (mono) when an experimental drug is administered.