Final answer:
The scatterplot shows the relationship between the temperature difference and voltage in a thermocouple. The variables are the temperature difference and voltage, with the former being the independent variable and the latter being the dependent variable. The scatter plot can be used to determine whether there is a linear relationship between the variables.
Step-by-step explanation:
The scatterplot shows the relationship between the variables temperature difference and voltage. It is a graphical representation that helps us understand how the temperature difference affects the voltage produced by the thermocouple.
The independent variable is the temperature difference, as it is the variable that we control and manipulate. The dependent variable is the voltage, as it depends on the temperature difference.
To draw a scatter plot, you would place the temperature difference on the x-axis and the voltage on the y-axis. Then, plot each data point representing the temperature difference and its corresponding voltage.
The line of best fit and correlation coefficient can be used to determine the nature and strength of the relationship between the variables. The line of best fit is the straight line that comes closest to all the data points, while the correlation coefficient represents the strength and direction of the relationship.
By analyzing the scatter plot, if the points closely align along a straight line, there is a linear relationship between the variables. This means that the change in temperature difference results in a predictable change in voltage.