Questions: A data set on Shark Attacks Worldwide posted on StatCrunch records data on all shark attacks in recorded history including attacks before 1800. Variables contained in the data include time of attack, date, location, activity the victim was engaged in when attacked, whether or not the injury was fatal, and species of shark. Which of the following questions could not be answered using the data set?

The answer is the first one: the original text in the question...

To determine which questions could not be answered using the data set, we need to consider the variables provided: time of attack, date, location, activity the victim was engaged in when attacked, whether or not the injury was fatal, and species of shark.

Here are some examples of questions that could and could not be answered:

1. Could be answered:

   • What is the most common activity victims were engaged in when attacked by sharks?
   • Which species of shark is responsible for the most attacks?
   • What percentage of shark attacks were fatal?

2. Could not be answered:

   • What is the average age of shark attack victims? (The data set does not include the age of the victims.)
   • What is the gender distribution of shark attack victims? (The data set does not include the gender of the victims.)
   • How many shark attacks occurred in a specific year if the data set does not include the year of the attack?

In summary, any question that requires information not included in the variables (such as age or gender of the victims) could not be answered using this data set.