In this exercise it says “Use the sample standard deviation expression”. I know this is not a course about statistics, and I’m not an expert in that field either, but I wonder whether, for this example, we should use the population deviation instead.
As explained here:
…you would normally calculate the population standard deviation if: (1) you have the entire population or (2) you have a sample of a larger population, but you are only interested in this sample and do not wish to generalize your findings to the population.
In the lab, we are presented with the situation 2: we are interested in the sample of movies with Oscars, and we do not want to generalize that value to the population. That is, we don’t want to generalize that value for movies without Oscars.
Although, now that I think twice, maybe we should use stdDevSamp because it is understood that we don’t have the entire population of movies in our database.
If any expert in statistics reads this, please clarify. Thanks!