I have a hard time understanding sigma calculation. sigma x = 5.6, and sigma y =

Question

I have a hard time understanding sigma calculation. sigma x = 5.6, and sigma y = 240. how did they get sigma x2 (=5.815) and sigma xy (=245.31) in this image? is there an online calculator?

Sur. Area to Vol. (mm2/mm3 1.54 1.09 0.93 0.72 0.64 0.68 Researchers investigated the effect of tablet surface area Drug Release Rate (% released/Vinne) volume on the rate at which a drug is released in a ) to controlled-release dosage. For six similarly shaped tablets with different weights and thicknesses, the diffusional drug release rate (percentage of drug released divided by the square root of time) was determined. The experimental data are listed in the table. Complete parts a through d 63 46 43 35 27 26 x = 5.6 x-5.6 y2 = 5.815 y=240 xy-247.31

Explanation / Answer

X Y XY X^2

1.54 63 1.54*63 = 97.02 1.54^2 = 2.37

1.09 46 1.09*46 = 50.14 1.09^2 = 1.18

0.93 43 0.93*43 = 39.99 0.93^2 = 0.86

0.72 35 0.72*35 = 25.2 0.72^2= 0.51

0.64 27 0.64*27 = 17.28 0.64^2 = 0.40

0.68 26 0.68*26 = 17.68 0.68^2= 0.46

IF WE TAKE THE SUM OF RESPECTIVE COLUMS WE WILL GET THE REQUIRED ANSWERS

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.