Statistics: Ch 9 Hypothesis Testing (9 of 35) What is the Critical Region? (Intuitive)

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We will learn the intuitive “feeling” of what we mean by the Critical Region using an example of manufacturing screws that should have a shear strength greater than 120 pounds with sigma=12 pounds, and a sample size of n=36.

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[Wsopsuit]

it helps me for preparing my actuarial course a lot. thanks!

[yusufmustafa]

Happy to see you sir
I always enjoy your wonderful explanations.

[JnSubli]

Hi sir, I understand now that 5% probability the null hypothesis could still hold true and the other 95% probability to be untrue and with the new population or sample mean ranging from anything greater than 120. Now let's say newly revised population or sample mean is estimated to be most probable at 114 so my question is how about it's standard deviation now would it still be the same or different and the probablity still getting the same conclusion if this same test is being repeated?

[ericlam]

so standard error = standard deviation of the sampling distribution? I found the equations are the same

[kurdish]

Hi.. I have a question please answer me
the reason for the light from the electricity-free light 💡 ?

[ericlam]

if we cannot check every single piece in the population, how can we know the population standard deviation?