Final answer:
The MATLAB command to create a plot of sales data versus the years is 'plot(yr,sle)'. This generates a scatter or line plot showing how sales data (sle) correlates with years (yr). Additional analysis such as finding the least-squares regression line or the correlation coefficient can further interpret the relationship between the variables.
Step-by-step explanation:
The command to create a plot of sales data versus the years in MATLAB is plot(yr,sle). This command takes two arguments; the first is the x-axis (in this case, 'yr' for years) and the second is the y-axis (here, 'sle' for sales). By using this command, MATLAB will generate a scatter plot or line plot that visualizes the sales data over the years. It's important to ensure that 'yr' and 'sle' are vectors of the same length, as they represent the x and y coordinates of the data points in the plot.
When working with plotting and data analysis, particularly with sales data, one often carries out further steps, such as:
- Calculating the least-squares regression line and adding it to the scatter plot.
- Determining the significance of the correlation coefficient.
- Examining the relationship between the variables.
These steps are crucial for interpreting the relationship between the variables and making predictions or estimates based on the regression line.