Discrete Random Variables: Distributions 2 

Happy to hear it

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Great to hear! That is what I aim for.

Glad to hear it!

Glad to hear that

Thanks for spotting that. It looks as if the power of 2 has slipped down! Unfortunately there is no way to edit the video and put it back. I will see what I can do to put a card in.

Thanks. In fact you should never say the probability the hypothesis is true. You say the probability of getting a result like this if the null hypothesis is true, which is similar, but not the same. Watch the video, Understanding the p-value ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eyknGvncKLw.html to make that clearer. Then watch how to do hypothesis test in Excel, as it shows where the value comes from. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Y3mGoW5w28c.html Hope that helps

@@DrNic Thanks!

God I'm high.

Thanks a lot

You are welcome, from New Zealand. I love hearing from people from far away places.

In the video there are examples of each. If you have independent occurences from two different distributions, we would want to combine them, such as the number of ice creams bought by two customers. If you use a constant you might be looking at the amount spent - a constant amount times an item.

Sure.

Yes there is an error there, which is explained in the description.

It really is.

@@DrNic Phew. Acknowledgement from experts make me feel less stupid. Especially the random varibles which can take negative values is pretty non-intutive. Dr.Nic, I am struggling with computing the square of random variable for the past 5 days, if it is not too much hassle consider answering. I have made multiple post on math stack exchange and could not get an answer for this. Example: If P{X=−1}=0.2, P{X=1}=0.3. Then P{X^2 = 1} = P{X = −1} + P{X=1}= 0.5 . I understand if X^2=1 then X=±1. But why the probabilities are added, why not they multiplied ? Thanks

John Hammer Remember that OR translates to +. For x squared to equal 1 then X = 1 OR X =-1. Because there are two different ways to get x squared = 1 we are adding them together. Let me know if you need more explanation.

@@DrNic I was thinking about literal multiplication and it makes total sense when thinking about it as a venn diagram of events. Thanks so much Dr.Nic for understanding what i was missing exactly. Never thought youtube comments would be so much educational.

I like to help my viewers.