Confidence Intervals for One Mean: Determining the Required Sample Size

I find the sample size required to obtain a given margin of error in a confidence interval for mu. I discuss the appropriate formula and work through an example.

[tychothorpe]

you are beginning to be my favorite person right now... I have been looking for an easy to understand formula for this for hours

[tufrabza]

This was exactly what I was looking for, thanks for saving my sanity~

[bornhere]

I watch these for fun now. Can we expect another series of videos from you in the near future?

[raeventkaul]

Great Work!, queries solved on comments too! is this an ideal world

[personalbranddata]

Since the standard deviation is usually not known, can you make a video like this but use the t-distribution instead of the normal distribution?

[mileesingh]

Sir, why this formula is not being used [z^2(standard deviation) (1-standard deviation) ]\ e^2

[libertarianPinoy]

Can you do this with unknown sigma and population correction factor?

[richardl.]

If we dont know sigma but we kne the sample st. Deviation, would we be using the t critical value instead of z ?

[hafiqzuddinshaari]

may i know the reference for this formula??

[renayachan]

sir, does m also means the width of the confidence interval?

[abdullahiibrahim]

plz what do excetly mean meu with in 4
help

[JuiceBoxBoiii]

Hello, thank you for making these videos. They are very helpful - I had a question. Why does a larger confidence interval require a larger sample size? I thought increasing the sample size decreases the width of confidence interval - because it decreases the standard error.
Am I misunderstanding something? Thank you.

[evanjones]

what does "within four" mean?

[damontse]

Hi, if it is “less than 4” do i sub m=4?