A statistical question has to include all the parts of a problem and be able to narrow down the data needed enough to be able to make a graph or model and get the necessary information but not so much as to be too broad. A decent answer to this question would be "How much time do players in this team spend practicing during the off season in a particular year?"
A statistical question is a question isn't too vague nor too broad and can be used to collect statistics and data to answer the question. An example of this is "In inches, how tall are the giraffes in Exhibit 4 of the Mars Zoo?" Of course, the Mars Zoo isn't real, but this is an example. The question isn't too vague. If it were, it might only be asking for data from only a single individual. It's also not too broad. Otherwise, it would be asking for much more data, such as all of the exhibits in the zoo, or even the whole world! This is a great example of a statistical question. A non-statistical question would be something along the lines of "How much time do team members spend practicing during the off-season?" This question is not a statistical question due to being too broad and the data needed to be collected not specified completely.
In order to create a statistical question, you should first identify what you need to know and what data needs to be collected to answer the question. The coach wants to know how much times each player on the team spends practicing every week during the off-season. The data that would be collected in this case is time practicing.
Now we can write our statistical question! Without being too vague or broad, we can ask about how much time, in hours, players on the coach's team spend practicing the sport played by that team during the off-season. Something like the following question would be a good answer: "How much time, in hours, do players of the coach's team spend practicing the sport their team plays during the off-season?" This question isn't too broad. It specifies that only the time data of this specific team spends practicing a single specific sport during a given time range. The question also isn't too vague, since it specifies the entire team rather than only a couple players, and since it asks for a wider time frame than just a couple days.
