The following relations exist between material flexural strength and grain size:

Flexural strength, x $($MPa$)656367646862706668676971$

Grain size, y $($nm$)686668656966686571676870$

Use least squares regression to determine the coefficients of the linear fit. You may use a

spreadsheet $($or other software tool$)$ to perform calculations, as in class; however, you must

clearly indicate the equations used to find the coefficients, and show how the values of the

constituent terms are determined from the software. The final result should include a plot of

the data points, with properly$-$labeled axes, and a straight line indicating the least$-$squares fit.

Do so in excel preferably