Answer: Statistic
Step-by-step explanation:
The quantity described in the sentence is a statistic. A statistic is a numerical value calculated from a sample, while a parameter is a numerical value that describes a population. In this case, the correlation between final exam marks and the number of hours spent studying per week is based on an interview of some randomly selected students. The fact that the data was collected from a sample of students indicates that the correlation is a statistic. The notation for the correlation coefficient is typically represented by the symbol "r". So, in this case, the statistic would be denoted as "r". To further illustrate, let's say the correlation coefficient (r) for this study is 0.75. This indicates a strong positive correlation between final exam marks and the number of hours spent studying per week. It means that as the number of hours spent studying per week increases, the final exam marks also tend to increase. It's important to note that if the correlation was based on the entire population of students, it would be a parameter and not a statistic. But since the data was collected from a sample, it is considered a statistic.