# Statistics

posted by .

X = 7 and SX2 = 21. A new variable Y is created by multiplying each X by 3. What are SY and SY2 equal to ?

I do not understand.

• Statistics -

I am unfamiliar with your notation. Is X supposed to be the mean of a set of X's? In that case you should have called it X with a bar under it or Xmean. Is SX2 the variance of the set of X's? If you triple all the X's to get a set Y, The new Ymean is triple the value of Xmean, and SY2 becomes 9 SX2 = 189

## Similar Questions

1. ### Ratios and proportions

RATIOS AND PROPORTIONS x 3 - = - 4 2 The boards don't post spacing as we would wish. I suppose the problem is x/4 = 3/2. Multiply left and right sides by 4. That will "cancel" the 4 in the denominator of the left side. Now multiply …
2. ### math

someone please help me understand how this is done.state all the restritions on the variable 7x-13/x^2-16 Your problem: 7x - 13 ------- x^2 - 16 The restrictions are that x cannot equal 4 or -4. The denominator of a fraction cannot …
3. ### Statistics (binomial random variable)

Let x be a binomial random variable with n = 10 and p = .4 Find the values. P (x›4) P (x≤4) I could really use some examples to help me get started and understand it. Thanks
4. ### Statistics

1. In thinking about doing statistical analysis, the sample mean should be interpreted as: A.)a constant value that is equal to the population mean. B.) a constant value that is approximately equal to the population mean. C.) a random …
5. ### psychology

dr. gibson has created a new energy drink which he hopes will also make a person smarter when testing his new drink what is the independent variable and what is the dependent variable?
6. ### psychology

dr. gibson has created a new energy drink which he hopes will also make a person smarter when testing his new drink what is the independent variable and what is the dependent variable?
7. ### math(statistics)

suppose a random variable X can equal to 1,2,3,4,or 5. if P(x<3)=.4 and p(x>3)=.5 (a)p(x=3) and b P(x<4)
8. ### math

Define a new class Assistant that represent a faculty member who works a certain number of hours each month. In this case, the salary is computed by multiplying the working hours by the hourly payment rate.  Create a new object …
9. ### statistics

In a correlation study, we seek to determine; *if the IV cause an outcome in the DV. *Which variable is the cause and which variable is the effect. *The direction of causation. *How well one variable predicts another variable.
10. ### computer science

ƒnDefine a new class Coordinator that represent a faculty member who works a certain number of hours each month. In this case, the salary is computed by multiplying the working hours by the hourly payment rate. „ÏƒnCreate a new …

More Similar Questions