How To...Calculate the Confidence Interval for a Sample

Use Confidence Intervals to determine a best estimate of the range of a population mean based on the sample mean. A 95% Confidence Interval will be correct 95% of the time.

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I had no clue on how to calculate this but after watching this video I can confidently say I will never fail this.

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I've learnt about finding confidence level after watching your video.

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[@Rawennnnn]

Really helpful! How to calculate confidence intervals of variance (n under 30)?

[@Baljindersingh-nb9jy]

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[@thinkingahead6750]

Thank you that was very clear. I am trying to understand what it means when someone says something like "that is one standard deviation out" when talking about outliers in a population. I heard it in relation to the distribution of IQ results and the challenges faced by people with an IQ at a certain (low) level?

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[@nadinemaarouf4996]

thank you. how do we know when to use the t table vs z score?

[@bigseekersb]

I've seen other sources that state you can't estimate the mean with such a small sample size (n=14) unless you already know the original population data is normally distributed. That requirement was not mentioned anywhere in this video.

[@diminarchy]

Isnt the t distribution for that? Wouldnt it be a z value for n>30 (im genuinely confused so pls weigh in lol)

[@jabbedcrab]

@@diminarchy yes, that’s the exact reason why we use t-dist. We also don’t use T If we are given the population standard deviation.

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[@rajbhushan3541]

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[@fxbbb]

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[@jeenjoy7358]

what if your degrees of freedom is 199? how do we find the values there?

[@erik9817]

Nice, and what if my T table only has one-tail?

[@aditya._.d3shmukh]

very helpful!

[@jarrelldunson]

Thank you

[@cuttingedgetechsongsmovies9662]

Two-tailed t distribution table was used, right?

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Simple and best

[@celinemary2914]

Compute for the minimum sample size using an appropriate formula. Assume that no similar study has been previously done and that the level of variability is unknown. Use 2% level of precision and 90% level of confidence. Could you please explain this to me sir!

[@veerakanneboina8086]

What does this +/- in confidence interval formula accounts for.

[@aimijutt8340]

thankyou soo much

[@Graanvlok]

Why do we indicate the t values on the curve? Shouldn't we be indicating the upper and lower limits (i.e. in this case 992.95 and 999.47) there instead?

[@vialeyrichards4244]

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