Suppose variable is the speed of a car and variable is the car’s travel time to its destination. You suspect that if the car decreases its speed, its travel time to the destination increases. Does this follow a positive correlation, negative correlation, or no correlation?
Suppose variable is the speed of a train and variable is the time for the train to get to the station. You suspect that the more the train increases its speed, the less time it takes to get to the station. Does this follow a positive correlation, negative correlation, or no correlation?
The following scatterplot shows the heights and weights of 24 students in a class. Which of the following is true?
What type of correlation does the graph show?
If the data points all line up on the line of best fit, what does this say about the data?