How to Calculate Standard Deviation (Uncertainty) for Measured Values

Рет қаралды 96,615

9 жыл бұрын

To find the uncertainty in our measurements, we will often calculate the standard deviation of the measured values. In this video I explain how to calculate standard deviation (uncertainty) from measured values.
Note: The final range should be 3.40 to 3.48.
Additional Source: Clemson University Physics Lab Tutorial on Standard Deviation - science.clemson.edu/physics/la...

Пікірлер: 66

@absentvictim 3 жыл бұрын

I was nervous when I saw equations like this come up in my physics 1 lab so I stopped and came to KZfaq. This video made it look very easy! Thank you for this great explanation!

@CALettsomePhDPE 3 жыл бұрын

You are welcome. LIke, Share, and Subscribe.

@laurencooper9076 8 жыл бұрын

really nice description - i think i FINALLY feel comfortable with this

@pandacutiesuperstar 6 жыл бұрын

Thanks! I was really lost in lab and this clarified a lot!

@lc-tech2366 2 жыл бұрын

Thank you sir best wishes from Sri Lanka 🇱🇰

@science4u515 3 жыл бұрын

Thank you so much I did uncertainty calculations for my ICP-MS AND ICP-OES your video helped me very much.

@CALettsomePhDPE 3 жыл бұрын

Thank you. Please subscribe, like and share.

@science4u515 3 жыл бұрын

@@CALettsomePhDPE sure

@HannoWg 8 жыл бұрын

One of the best illustrations i have ever seen for explaining uncertainty. Keep up .

@cyrusIIIII 5 жыл бұрын

actually lots of wrong things happening there!

@cameroonpoe 4 жыл бұрын

Very helpful, thank you so much. I have struggled to distinguish those for quite some time.

@CALettsomePhDPE 4 жыл бұрын

Glad it helped! Like, Share, and Subscribe!

@parindyahitharshi2563 3 жыл бұрын

Thank you so much. I was basically lost in this equation but you made everything very clear.

@CALettsomePhDPE 3 жыл бұрын

Glad it helped! Like, Share, and Subscribe!

@davenandrew7292 Жыл бұрын

Thank you Sir. Your video is very helpful .

@tiffanyd7939 3 жыл бұрын

Finally!!!!! Thank you so much for posting this video!!!!!!

@CALettsomePhDPE 3 жыл бұрын

No problem!! You're welcome! Like, Share, and Subscribe!

@geomatist 6 жыл бұрын

great work, thank you

@vuchina82 8 жыл бұрын

3,40 - 3,48 ;)

@CALettsomePhDPE 5 жыл бұрын

You are correct. When I first posted the video I used a KZfaq feature to add a note about the incorrect range and I corrected it then. However since then KZfaq has discontinued that feature feature. I found an alternative way to add a note to add a note to that section of the video. Thanks for your comments.

@kandpalpreeti1 5 жыл бұрын

Yes. nice explanation but it think it should be in a range of 3.40 - 3.48 (as it is +- 0.04 and 3.44 is the average value)

@CALettsomePhDPE 5 жыл бұрын

@user-hz6so7mk1r 6 ай бұрын

Thank you for the informative video, If the equipment errors is larger than the standard deviation? how do we write the uncertainty value for the final results?

@Terraproject 3 жыл бұрын

Thank you for the clarification!

@CALettsomePhDPE 3 жыл бұрын

You are welcome. Like, Share, Subscribe.

@mrganesan9137 5 жыл бұрын

used your method for my reports. Thanks

@CALettsomePhDPE 5 жыл бұрын

Good luck with your assignment.

@hemabewal1528 2 жыл бұрын

Thank u sir nice explaination

@CycleTheDark 4 жыл бұрын

thnx man u r awesome

@CALettsomePhDPE 4 жыл бұрын

Thank you. Please like, share and subscribe.

@norhafizisapizglocal5452 3 жыл бұрын

tq..very good teaching

@CALettsomePhDPE 3 жыл бұрын

You are welcome. Like, Share and Subscribe.

@prakharjain4180 3 жыл бұрын

Hello is this as per NABL guidelines ? and what is the difference between Standard Deviation, Uncertainty, Acceptable error and Tolerance ? In this video you explained uncertainty for 3.40 is ±0.4 is this also the acceptable error limit. I also want a clarification on all this parameters. Thanking you, Awaiting for your reply.

@CALettsomePhDPE 3 жыл бұрын

Hi Prakhar, Thank you for asking. The information in this video meets no industry standards criteria. It is video I used for educational purposes. Please consult the appropriate industry standards for their standards.

@bai9661 8 жыл бұрын

thank you.

@hazimalkurishy9100 3 жыл бұрын

IF YOU HAVE more math examples as a pdf could you please uploaded here

@madusurplus8768 7 ай бұрын

Is there a difference between standard uncertainty and uncertainty or are they the same thing

@awadibrahim2785 5 жыл бұрын

Very nice , this is standard deviation or uncertainty calculation or both are same?

@awadibrahim2785 5 жыл бұрын

Because all times i had a problem with uncertainty calculation and now if it is what video contents it will easy for me ....thanks

@CALettsomePhDPE 5 жыл бұрын

They are the same. Thank you. Like, subscribe, and share.

@awadibrahim2785 5 жыл бұрын

Thanks dear

@Sanderleon 4 жыл бұрын

@@CALettsomePhDPE Uncertainty and std are not the same thing: Uncertainty takes into account the std deviation and not the other way around. which means they are directly related, but they are not the same. I work with wind conditions and when calculation the uncertainty of measurements you need to take into account, the range of the measurement equipment, the std of the samples recorded, etc. Hope that helps, surprised you considered those are the same.

@muneshjadaun1239 2 жыл бұрын

In end x bar value not put in formula please tell me

@parvathakkar5162 3 жыл бұрын

God bless your soul

@CALettsomePhDPE 3 жыл бұрын

Thank you! And God bless your soul. Like, Share, Subscribe!

@ahmadnathoka7348 6 жыл бұрын

Last py kesy howa hy???

@mustaqeemalmahdi4596 2 жыл бұрын

Sir I had a question.........Why did u use the sample variance formula instead of the standard deviation for population formula?

@eriakinfisoye8033 10 ай бұрын

Same here, I'd like to know that

@PRSakya 5 жыл бұрын

3.40 ... 3.48

@ijnsama9687 3 жыл бұрын

Thank you

@CALettsomePhDPE 3 жыл бұрын

You're welcome. Please like, share and subscribe.

@planetm1675 Жыл бұрын

👏

@mohamedgamal7600 6 жыл бұрын

Dear, shouldn't we write the final answer as 3.4 instead of 3.44 since the uncertainty has one sig fig. ?

@elenabal4885 6 жыл бұрын

No, the result and the uncertainty should have equal number of decimal places: 3.44 +/- 0.04. Another examples: 5.3+/-0.2 ; 5.300 +/- 0.225

@onlybelievechristianassemb5072 3 жыл бұрын

how 0.0016 to two significant figures is 2 * 10 pwr - 3 ... is beyond me

@CALettsomePhDPE 3 жыл бұрын

I think this will help. kzfaq.info/get/bejne/m8iqqcx5lquUqYk.html

@tavitirajututika1479 Жыл бұрын

Tq u .but final one having some mistake

@ac7plays152 3 жыл бұрын

Sir please help me in calculating unceratinty of T^2 using standard deviation (t=time period)

@CALettsomePhDPE 3 жыл бұрын

Hi AC7plays, Thank you for asking. Unfortunately I am not doing any tutoring. There may be other videos on KZfaq that maybe able to help you do so. Good Luck!