W2s - WS 2 1016-351 Coverage 1.3 1.4 Dr Chulmin Kim KEY 1...

• Notes
• 2

This preview shows pages 1–2. Sign up to view the full content.

WS solution for Probability (KIM) Page 1 WS # 2: 1016-351: Coverage - 1.3, 1.4: Dr. Chulmin Kim KEY 1. For a sample of size 4, if 1 2 3 10, 8, and 6, x x x x x x     then the sample variance is equal to _____ 72 _____. Use the property that the sum of all deviations always is zero, we can find 4 4 x x . So the sample variance is [10 2 +(-8) 2 +(-6) 2 +4 2 ]/(4-1)=72. 2. Calculate the values of the sample mean and sample standard deviation for the following observations on fracture strength by the computational formulas and calculator. 128 131 142 168 87 93 105 114 96 98 The sample mean, 1 1 (1,162) 116.2. 10 i x x x n The sample standard deviation, 2 2 2 ( ) (1,162) 140,992 10 25.75 1 9 i i x x n s n 3. Please refer to the following data. 86, 93, 45, 49, 51, 44, 77, 74, 92, 80

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern