What are the Sum of Squares and Mean Squares Errors?

Four basketball teams took a random sample of players regarding how high each player can jump (in inches).

To calculate sum of square of Errors and mean square Errors, use Ti-83 calculator. For this, click on STAT $\to$press $1\to$EDIT, then put the above given weights of different groups data into the list $L1,L2,L3,L4andL5$. The screenshot is given as below:

Now again press STAT $\to$arrow over the TESTS $\to$arrow down to ANOVA $\to$Press var then select $1$, press var then select $2$, press var then select $3$, press var then select $4$and press var then select $5$to fill the values of $L1,L2,L3,L4andL5$. The screen shot is given as below:

Press ENTER. The screenshot of the obtained output of calculated value sum of square of Errors and mean square Errors is given as below:

Thus, sum of square of Errors is $237.33$ and mean square Errors is $23.7$.