Final answer:
The correlation coefficient (r) measures the strength and direction of the linear relationship between two variables.
Step-by-step explanation:
The correlation coefficient (r) measures the strength and direction of the linear relationship between two variables. It ranges between -1 and 1. A value close to 1 indicates a strong positive correlation, while a value close to -1 indicates a strong negative correlation. In this case, we cannot determine the correlation coefficient without any data or information about the number of restaurants and the year. Therefore, none of the given options (-1.57, 0.82, -0.36, 1.00) can be considered as the correct answer.