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Mar
10
accepted Finding the x and y values such that the partial derivatives are zero simultaneously (part two)
Mar
10
comment Finding the x and y values such that the partial derivatives are zero simultaneously (part two)
Oh, I see. Thank you, Cameron!
Mar
10
comment Finding the x and y values such that the partial derivatives are zero simultaneously (part two)
Yes, that is what I did. Then I had simultaneous equations, $2y = 0$ and $2x = 0$. When I added the two equations together, I got $2x +2y = 0 \implies y = -x$.
Mar
10
asked Finding the x and y values such that the partial derivatives are zero simultaneously (part two)
Mar
10
accepted Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously
Mar
10
comment Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously
What I meant is that I didn't check if each partial derivative is equal to 2 at the same x and y values.
Mar
10
comment Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously
Oh, I see! So, the way I solved it gives me more solutions than I want. It includes the point when they are both zero, but it also includes when they are both, say, 2 (I didn't actually verify if they actually equal each other at that value). Is that correct to think?
Mar
10
comment Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously
Well, I figured since that both the partial derivatives were equal to zero, then they must equal each other. Why can't I just simply set them equal to zero?
Mar
10
asked Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously
Mar
9
comment Standardized Normal Distribution Problem
Yes, that is what I get too. The answer keys says that 0.1336 is the answer.
Mar
9
comment Standardized Normal Distribution Problem
I'm terribly sorry. This was a question I was going to ask, but decided not to; and stackexchange saved the title.
Mar
9
asked Standardized Normal Distribution Problem
Mar
9
comment Determining The Value, c, A Random Variable Assumes
I'm sorry. I think I am still a little confused about this problem. I thought that I was suppose to find two c-values, they being equal but having opposite sign. Furthermore, I thought I was suppose to find the area of the left and right tails.
Mar
8
accepted Determining The Value, c, A Random Variable Assumes
Mar
8
comment Determining The Value, c, A Random Variable Assumes
Oh, I see. Shouldn't $P(Z \le c) = 1 - 0.008$ actually be $P(Z \ge c)$?
Mar
8
comment Determining The Value, c, A Random Variable Assumes
I'm sorry, but I still don't follow. How did you rewrite $P(|Z| \ge c)$, to solve for the c-value?
Mar
8
revised Determining The Value, c, A Random Variable Assumes
added 2 characters in body
Mar
8
comment Determining The Value, c, A Random Variable Assumes
Oh, I am terribly sorry. I forgot to type the absolute bars in the original question. How did you arrive at that answer?
Mar
8
comment Determining The Value, c, A Random Variable Assumes
They got 2.41 as an answer. I can't how that is true.
Mar
8
asked Determining The Value, c, A Random Variable Assumes