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Examples of null and alternative hypotheses | AP Statistics | Khan Academy

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Examples of how to write null and alternative hypotheses.
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Опубликовано:

22 авг 2024

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Комментарии : 32

@jillianlouisehernandez9116 Год назад

Thank you I'm glad I came across this video the other ones are kinda too complex for a 7th grader I just need a simple meaning for the Null and Alternative Hypothesis for my homework thank you again ❤

@ChituOkoli 4 года назад

Two problems: first, and more serious, the null hypotheses should be ⩽, not =. These are not equality hypotheses. (That is, they are one-tailed, not two-tailed.) Second, the multiple choice options A and B are simply irrelevant. Only C and D are plausible answers.

@tahrimamohsin976 4 года назад

Chitu Okoli A coffee dispenser claiming to dispense 530mL coffee SHOULD dispense exactly that amount, not more not even less. So the null hypothesis is indeed an equality hypothesis.

@alberto-4282 4 года назад

If there's a coffee dispenser that CLAIMS to dispense EXACTLY 530 milliliters then the null hypothesis should be an EQUALITY hypothesis you idiot.

@ChituOkoli 4 года назад

@@tahrimamohsin976 : The video is mistaken in mixing an equality null hypothesis with an inequality alternative hypothesis. Either both should be equality or both should be inequality; you cannot mix the two. Here is what the video shows: H0 : μ = 530 mL Ha : μ >/< 530 ml This is wrong no matter how you look at it. Only one of the following is valid: H0 : μ = 530 mL Ha : μ ≠ 530 ml H0 : μ ≤ 530 mL Ha : μ > 530 ml H0 : μ ≥ 530 mL Ha : μ < 530 ml I hope my point is clearer now.

@ChituOkoli 4 года назад

@@tahrimamohsin976 : By comparison, the second example about sleep correctly matches inequality hypotheses. The mistake is only in the first example on coffee dispensing.

@medielijah 4 года назад

@@ChituOkoli I agree with you. But this is just a formality, the calculation is the same. He was teaching, his point was to simply explain what the null hypothesis means or is.

@chessandmathguy 6 лет назад

4:15 we usually teach that the null has to involve equality, so mu=8.

@sagarsahni3660 3 года назад

NO - when you talk about null- it says null hypothesis sign should have = , greater tha = and less than = - in this expamples he has mentioned greate than = so its correct