Sunday

January 25, 2015

January 25, 2015

Posted by **Fakaapo. Suetusi** on Wednesday, April 18, 2012 at 4:42am.

Thank you for your help.

- Please can you help me (Probability) -
**MathMate**, Wednesday, April 18, 2012 at 7:31amSuppose the dataset is:

x(i)=1,3,5,7,9

sum=∑x=25

mean=μ=25/5=5

x(i)^2=1,9,25,49,81

sum of squares=∑x^2=165

Var(x)=(165-5^2)/5=28

If all the numbers in the dataset are multiplied by 2:

x(i)=2,6,10,14,18

sum=∑x=50

mean=μ=50/5=10

x(i)^2=4,36,100,196,324

sum of squares=∑x^2=660

Var(x)=(660-10^2)/5=112 (=4*28)

What can you say about the effect on variance of multiplying the dataset by a constant?

**Answer this Question**

**Related Questions**

math - Please can you Use an example to explain whether multiplying the same ...

Math....please help - A set of 50 data values has a mean of 27 and a variance of...

Someone plz help me....i need help this is due now - A set of 50 data values has...

Statistics - A set of 50 data values has a mean of 27 and a variance of 16. I. ...

MATH - A set of 50 data values has a mean of 27 and a variance of 16. I. Find ...

stats - A set of 50 data values has a mean of 30 and a variance of 4. I. Find ...

Can someone help me please? - A set of 50 data values has a mean of 15 and a ...

Homework Help - A set of 50 data values has a mean of 48 and a variance of 9. I...

MATH - A set of 50 data values has a mean of 18 and a variance of 4. I. Find the...

Statistics - A set of 50 data values has a mean of 35 and a variance of 25. I. ...