Recent content by Vital

Thank you very much for your answers and guidance.

Hello. I have listened to a great lecture, which gave helpful intuitive insight into correlation and regression (basic stuff). But there are formulas, which I cannot grasp intuitively and don't know their origin. To remember them I would like to understand what's happening in each part of the...

I am sorry but I still don't understand how it works and how to choose a correct value from the table, given all these different approaches which seem to contradict each other in all 4 examples I showed. I seem to understand a bit more the meaning of the chi-squared test used in the first and...

Hello. I am doing problem sets on very basic stat topics. When solving problems that require the use of chi-squared table, I stumbled upon an unexpected issue. I seem to miss something important about how to correctly choose the right critical value using the chi-squared table. Below are two...

Hello. I wonder how to see if the distribution is normal or not based on the numbers in the table. I attach the screenshot with the table, and it is written that "the distribution appears to be bimodal", so it appears to have two peaks. I understand the the question sounds silly, but I truly...

Thank you very much. But I am not sure what you mean when you say that 36% is not correct. 1 - 1/1.25^2 = 36%, hence around 36% fall with +/- 1.25 standard deviations from the mean. Why is this incorrect?

Thank you) Can you, please, recommend books, which help to develop mathematical thinking, understanding, intuition, etc?

Thank you very much. It is much clearer now. So if in this or that problem it is stated that the distribution is normal, then I can use confidence intervals. But when the distribution is assumed to be non normal, then I should use the Chebyshev inequality to define the interval around the mean...

Hello. I am bewildered by so many different notions of probability distribution percentages, i.e. the proportion of values that lie within certain standard deviations from the mean. (1) There is a Chebyshev's inequality: - for any distribution with finite variance, the proportion of the...

Thank you. But is it really so that not all formulas can have an intuitive, or logical, interpretation and meaning? I truly don't think so. Of course, I am very bad at math, and it is not my main subject (though, honestly, I wish I could know and understand it at a much much deeper level - I...

Thank you very much for such detailed explanation. But it gets away from my question and is too complicated for me) I don't have that much knowledge of statistics, and I am merely trying to understand the meaning of each part of the formula I gave in my question, as I described there. By meaning...

Hello. I will be grateful for your help in finding the logical meaning of each part of the formula of degrees of freedom, which are computed for a t-test when variances are unknown and are assumed to be unequal. Please, take a look at the formula, the way I managed to understand some parts of...

I wish examples and explanations of statistics would be more positive ones - I don't understand why the majority of examples are based on medical themes, using truly horrific ones. I can't study math on these examples.

Thank you very much. I will study it now.

Hello! I am trying to get to grips with the Bayes' formula by developing an intuition about the formula itself, and on how to use it, and how to interpret. Please, take a problem, and my questions written within them - I will highlight my questions and will post them as I add the information...