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Recent questions tagged variable


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Is zip code a categorical variable?
1 answer 14 views
Is zip code a categorical variable?Is zip code a categorical variable? ...
by Pieter SIlver Status
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asked in Data Science & Statistics Jan 15
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What do you mean by categorical data?
1 answer 10 views
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Consider the differential equation $\left(2 x y-y^{n}\right) d x+x^{2} d y=0$.
0 answers 9 views
Consider the differential equation $\left(2 x y-y^{n}\right) d x+x^{2} d y=0$.Consider the differential equation $\left(2 x y-y^{n}\right) d x+x^{2} d y=0$. Which of the following statements is NOT TRUE?   (A) For $n=1$ t ...
by MathsGee Platinum
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asked in Mathematics Jan 13
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What does "controlling for a variable" mean?
1 answer 10 views
What does "controlling for a variable" mean?What does "controlling for a variable" mean? ...
by Pieter SIlver Status
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asked in Data Science & Statistics Jan 12
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What is a control variable?
1 answer 6 views
What is a control variable?What is a control variable? ...
by Pieter SIlver Status
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asked in Data Science & Statistics Jan 12
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What is the difference between confounding variables, independent variables and dependent variables?

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What is a confounding variable?
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What is the difference between the correlation coefficient and the slope of the line?
1 answer 11 views
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What do the sign and value of the correlation coefficient tell us?
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What is a correlation coefficient?
1 answer 9 views
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What is correlation?
1 answer 8 views
What is correlation?What is correlation? ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Jan 12
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What does a correlation coefficient of zero mean?
1 answer 8 views
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What are independent / dependent variables?
1 answer 15 views
What are independent / dependent variables?What are independent / dependent variables? ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Jan 8
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What is a coefficient?
1 answer 21 views
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Are there lots of integer solutions for the mysterious equation, or just a few? \[ n! + n = n^n\]
1 answer 38 views
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What is a hypothesis in statistics?
2 answers 43 views
What is a hypothesis in statistics?What is a hypothesis in statistics? ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Dec 16, 2021
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Give an example of a continuous random variable
1 answer 46 views
Give an example of a continuous random variableGive an example of a continuous random variable ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Dec 16, 2021
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When is X a continuous random variable?
1 answer 45 views
When is X a continuous random variable?When is X a continuous random variable? ...
by Pieter SIlver Status
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asked in Data Science & Statistics Dec 16, 2021
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When is a random variable X called discrete?
1 answer 39 views
When is a random variable X called discrete?When is a random variable X called discrete? ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Dec 16, 2021
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What are independent random variable in statistics?
1 answer 47 views
What are independent random variable in statistics?What are independent random variable in statistics? ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Dec 16, 2021
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What is a random variable in statistics?
1 answer 33 views
What is a random variable in statistics?What is a random variable in statistics? ...
by Pieter SIlver Status
(18,309 points)
asked in Data Science & Statistics Dec 16, 2021
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Prove that if \(X\) is a random variable with mean \(E X\) and \(c \in\) is \(a\) real number, then \(\operatorname{Var}(X)=E\left(X^{2}\right)-E(X)\)

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Prove that if \(X\) is a random variable with mean \(E X\) and \(c \in\) is \(a\) real number, then \(\operatorname{Var}(c X)=c^{2} \operatorname{Var}(X)\)

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Prove that if \(X\) is a random variable with mean \(E X\) and \(c \in\) is \(a\) real number, then \(\operatorname{Var}(X) \geq 0\).
1 answer 32 views
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How do you calculate the Coefficient of Variation and if the \(\mathrm{CV}\) is lower what does that mean?

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