Recent content by x^2

I have five groupings of data measurements, each group with a different quantity of measurements. I want to see if one grouping has higher measurements than the rest, but was told that using multiple t-tests was incorrect and that I should use ANOVA. I'm using R for the analysis. Exactly...

I had a question regarding a variation of the infamous Monty Hall problem. Assume four doors instead of the standard three. There is still one car and three goats, and of course the objective is to select the door with the highest probability that it is hiding a car. You select a door. The...

Yes, sorry, you are correct; they should be intersections and not unions. Thank you for the help! x^2

P(A|B) = \frac{P(A \cup B)}{P(B)} = P(A) P(B|A) = \frac{P(A \cup B)}{P(A)} = P(B) P(B|A) = \frac{P(A \cup B)}{P(B)} = P(A) P(A|B) = \frac{P(A \cup B)}{P(A)} = \frac{P(A \cup B)}{P(A)} = P(B|A) I think that is right... Thank you for the hint! x^2

Independent Probability... Hello, Could someone point me in the right direction of how to prove that P(A|B) = P(A) if and only if P(B|A) = P(B)? I think I understand the program and I can't formulate any contradictions, but I'm having difficulty showing this property with a formal proof...

The correct answer is 0 A. There was a problem with the system which was why I was getting it wrong. Thanks for the confirmation! x^2

That's what I thought... I tried 0 A but it was incorrect. I'm going to talk to the prof. and see what is wrong. Thanks! x^2

Homework Statement What current flows through resistor R1 (350 Ohms) in the figure when the applied voltage is 50 V? Homework Equations V = IR ? The Attempt at a Solution I would have thought the answer would be zero because I thought the potential at R1 is equal (but this was incorrect)...

Yes, I have figured it out... B = B_0*sin(kx - wt) B_0 is the given maximum value for the magnetic field. w = 2pi*f, where f is the given frequency. t is time, and it is given. You know the maximum value for the sin portion of the function is 1, as this is when you would get B_0 (B_0 * 1...

Homework Statement What is the y component of the magnetic field at point O at time 0.227*E-16 s? Given: Frequency: 2.20*E16 Hz Max value of B-field: 4.00*E-8T when t = 0 at point O Homework Equations I think the following two equations could potentially be applied to the problem: B =...

Got it... I have to divide the peak of the E field by Sqrt(2) to get the RMS or the average value so I can find the average energy. Thanks for such a great resource! x^2

Homework Statement The E field in an EM wave has a peak of 22.8 mV/m. What is the average rate at which this wave carries energy across unit area per unit time? Homework Equations S = e_0*c*E^2 The Attempt at a Solution where e_0 = 8.85*10^-12 c = 3*10^8 E = 0.0228 V/m S =...

Oh wow do I feel stupid now... Thanks for the help! x^2

Homework Statement The magnetic field inside an air-filled solenoid 39.9cm long and 2.00cm in diameter is 0.800T. Approximately how much energy is stored in this field? Homework Equations U=(1/2)LI^2 => U = (1/2)(B^2)(area*length)/(u) The Attempt at a Solution I discovered how to...

Thanks for the replies! C definitely makes sense when using the right hand rule. For some reason I was still relating Ci to Ax without thinking that they were perpendicular. As for F I see what they are asking for--I guess I was thinking that scalar had to mean magnitude but in actuality they...