This video helped me so much, thank you! I have a stats exam this coming Monday and I was struggling to understand this because my professor doesn't communicate the best way. You made it very clear and you are very well spoken! Thanks again
BY far the best explanation of SHADING area when given the AREA to find Z-value. TIP: for other people i find it it EASIER for to me UNDERSTAND it like this LESS THAN means shade from LEFT side (corner) to the right side
I have wasted so much time looking at other math videos, this hits the ball right out of the park. Thank you so much for sharing your knowledge, and teaching it so well. God bless you!
Why can’t you be my stats teacher!?? I’m an older student going back for my college degree and I have “thinks-she-doesn’t-understand-math-brain” but the way you explain it makes me de-stress and understand!!! Thank you!!!⭐️⭐️⭐️⭐️⭐️ PS I think I just figured out that you kind of ARE my Stats teacher now!
Yes Chara. If the probability you're looking for is not in the table, then choose the probability that is closest to it. It may be a probability slightly greater than the one you're looking for, or perhaps it's slightly less than it. Sometimes, the probability is exactly half way between two probabilities in the table. In that case, you can either choose the larger value, or you could split the difference between the two. Hope that helps!
Hi "jackd36". Yes, I do read these comments (good and bad ones). Well, look at the video again, beginning at minute 6:03. I show how to do a very similar problem to what you're asking about. Simply replace my P(z > ?) = 0.2389 with your P(z > ?) = 0.3300. The process is the same. Hope that helps!
I wonder why we don't want to get an area which is more than half in 7:48 , sir ? Thank you so much for your videos .. it has been a great help ! :) Bless you ^^
3:10 but there isn't any number for probability that corresponds to .025, rather, you got to take a complement of that, which is .975, which is then 1.96 in terms of z score.
Hi @poysermath, for your second example, how do you know that it should be over at the left side, and not right side, as in, the (-1.96) answer, how do you that it' has to be located at the left side of the distribution? Please help :)
hey Preeto, but the way that you know is that the probability of z score 0 is equal to 0.5 or 50%, any probability bigger that 50% has to have a z-score bigger than zero, and any probability that is smaller than 50% must have an z score smaller than 0.
You are wonderful sir. Love your videos and I learnt a lot. Keep posting please. Post some 'finding mew and s.d' please. How about poisson distribution? keep posting sir.
Whats the name of that log book bcoz ours in Uganda 🇺🇬 has tables of Normal distribution, critical point, and cumulative normal distribution under normal distribution topic they have a feature besides the right of "add and subtract" where coan i find that one u are using.?
Is there absolutely no way of calculing p(z=a) = b% by hand? Everyone refers me to tables but I want to convert it for multiple people and I cannot afford to do it by hand...
Aww 😅 I'm a little disappointed since I was expecting some kind of algorithm that would allow me to compute the corresponding Z score of a given p-value without looking at the Z table. I don't really need a Z table since I could easily find the corresponding p-value with just a few taps on my calculator (which is allowed during my statistics exam) and I was hoping to find a way to work backwards from there.
0.5 probability is like 50%. 0.92 ~ 92% of area. I think the subtraction of 1 is done when you work in reverse or you have 1 probability already given for another area.. And the question seeks that you find the probability of the adjacent. Since you know the total area is 1, and you've the adjacent area, you can just subtract it from 1, to find the 'remainder'. For example, you have the value of a Positive z=1.96. and you got a probability of 0.95. But you're trying to find the critical region area of the left. Technically you can use your current workings to work back by (1 - 0.95) / 2. I use 2 as its a two-tailed situation in a standard normal distribution. I' dont know how right am i, but its to my limited understand. Hope it helped at least abit.
6:17 *LMAO WHEN YOU'RE IN ART CLASS AND YOU SUCCESSFULLY DREW THIS ONE THING THAT LOOKED TERRIBLE BEFORE OOF AND YOU EVEN PAIR IT WITH A THUMBS-UP LMAO*
William Wallace Let's assume unknown variable as x, question says probability of p(z>x)= 0.2389. but the positive table shows from minus area to plus area(upto +z). As you know the whole area is 1 and we want to find more than +z area, so we deduct the given area(0.2389) from 1.
I have a question: Given that z is a standard normal random variable, find the z for each situation. 5.1) The area to the left of z is 0.2199 5.2) The area to the right of z is 0.6915 Help please Thanks in advance
