Step #$3$:

Determining the mean and standard deviation using the formulas seen in lecture.

a$)$ We will enter all the values in the column headed, $"x^{{?}^{{?}^{?}}}2"-$go to cell $B5$ and enter the command $"=$power$($A$5,2)"$ and hit enter

b$)$ To enter the remaining values in this column$-$click on the lower right hand corner of cell B$5$ and "drag down" keeping the left button on the mouse down the whole time $($Fill Handle$)($you can also double click the fill handle box$)$

c$)$ We need to find the sums of column headed $"x"$ and the sum of the column headed $"x^{{?}^{?}}2"--$go to the cell A$46$ and enter the command $"=$sum$($A$5$:A$44)"$; or enter $"=$sum" and highlight the data in this column; or click on the 'autosum' icon from the home page.

d$)$ Go to cell B$46$ and repeat this last step to find the sum of the $"x^{{?}^{{?}^{?}}}{2}^{\text{v}\text{a}\text{l}\text{u}\text{e}\text{s}-\text{c}\text{e}\text{l}\text{l}\text{s}\text{B}5\text{:}B44}$

e$)$ Go to cell D$4$ and type "sample size $(n)",$ then go to cell D$5$ and enter the command $=$count$(A5$:$A44)$ and enter.