Statistical Process Control | Chart for Means (x-bar chart)

[@juvenalmachado7693]

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Man you are the CEO of control charts, thank you so much

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Excellent and crisp explanation

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I am currently taking an operations and analysis class for my MBA, and the class confused me because the coursework was awful. This video was so helpful! Thank you.

[@lazhan2489]

Thank you for this. Less than 4 mins and I grasp the concept

[@joshemman]

My pleasure, Lazhan.

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Concise and simple explanation but easy and clear to understand

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I think you are a Master in quick and superb explanations.

[@DarthVader-do6fi]

Thanks. I have been trying to understand this for an exam and this cleared every thing in less than 4 minutes. Very informative and helpful

[@tapiwanalwimba6065]

Awesome explanation, still valid and simplified.. thank you.

[@joshemman]

My pleasure, Tapiwa. 🙏

[@kumargandharva9146]

one of the best video i found on you tube...............thanks for your effort

[@NikhilSharma-fw4pc]

best video on X-bar chart

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[@kellypups1628]

Perfectly clear and concise video. Thank you.

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amazing explanation, he cut the long story Short and Simple. Lee it up man. ❤

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The best video I've seen on this topic to date.

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very helpful and straightforward! thank you

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I am excited! Thank you!

[@dendinugraha4536]

Thanks joshua explanation is very clearly 👍

[@ryanreuben1407]

best explanation on this website thank you sir

[@tahirhanif9669]

Excellent presentation, thank you

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[@anirbanchakraborty9132]

nice and crisp video sir

[@BanafulPaul]

Excellent explanation. Thanks.

[@mattroche8454]

Brilliant video joshua. You explained this very clearly and concisely :)

[@dzub7840]

YOU ARE A LIFE SAVER !

[@judyhull4514]

Thank you - clear and easy to follow!

[@tareqal-hababi2954]

Thanks, sir! it's a very clear explanation.

[@thenicksonstvofficial.8904]

Since I knew your channel it has been my best learning center but I have lacked cusum charts sir, kindly find time to do a lesson on that.

[@RedPencil31]

Thank you for being so clear.

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Thanks for sharing this useful video

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Spr class easy to understand thnkuu sir

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Thank you ,easy simple explained

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Thank you so much, this was incredibly helpful!

[@Am-bf7td]

reaaallllyyyy helpfullll

[@evabrenda1619]

Very Helpful video, Thankssss

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Thank you so much, you're awesome

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the best. saved my life

[@joshemman]

[@bassalmalik2208]

Joshua Emmanuel hey can you please do a video on cusum control chart on R studio.

[@dmukherjee7956]

Where and how to find value A2?

[@sindhuyesudas264]

Best video ever💝

[@nikeackerman6789]

Thank you Joshua

[@hariharansk3324]

Good definition sir

[@pavanzade1580]

very well explained.❤

[@joshemman]

Thank you 🙂

[@ashutoshyawale6458]

Lovely explanation.

[@tarekh0]

Excellent video!

[@chantellechikukwa7488]

Thank you so much

[@queenestheromotoso8208]

You are a genius

[@isaacalawode7035]

Solid explanation

[@samkeloinnocent8316]

I feel like crying🥺😩 the way my lecture made this simple stuff complex and his videos depressed me, I had to go through the confusing textbook searching for this. Thank you so much so these videos.

[@joshemman]

My pleasure, Samkelo. Glad it helps.

[@damimongebas]

A set of data has a mean of .634 unit and a standard deviation of .005 unit. Construct an X Bar chart if the number of samples is 5

[@bhavikupadhyaya972]

thanks for helping me

[@xrosnero]

why did we use A2 and not A3? how to determine?

[@mohdmuneer5075]

awesome explanation.

[@nOnAmE-nl3qu]

Thank youuuu❤

[@samruddhiyelikar1921]

Thank you!🙌

[@whotookmymonkey]

Brilliant! Thank you!

[@learnstartbelgium5352]

Thank you boss!

[@christophergomez5131]

if the points you plotted were the same in the video, but the one out of control we within the UCL and LCL, would that mean it is in or out of control even if the majority of points is skewed upwards

[@anumkhan8342]

very helpful. thanks

[@JDMaxton1999]

Maybe can someone with a stats background answer this on here? If Joshua Emmanuel could himself that would be amazing. I've heard it said that setting up a control chart is essentially like doing a continuous test of hypothesis. In our case here, we are testing if the process is in control. H0: The process is in control (perhaps an equivalent test(s) could be that the LCL or UCL is equal to the value that you have shown H_alternative: The process is not in control. This is essentially a two tailed test because the out of control point could be either beyond the UCL or the LCL. My question is this... Assuming point P1 plots out of control. If we find an assignable cause to this point, is this not proof that our trial limits actually are good and the process was in control prior to this point? If our limits are truly bad, it would seem to me that we would not be able to find an assignable cause for our "out of control" point. If we don't find this cause, that is probably because our "out of control" point really is in control for whatever larger bounds we are supposed to have. I'm very confused.

[@joshemman]

Ho is a starting assumption that the process is in control. If you find an assignable cause to P1, then the process is truly out of control (rejecting a false null hypothesis). If you can’t find an assignable cause to the out of control P1, then you could be committing a Type I error if your limits are fine. It could be an error in measurement. If your limits are truly bad (too wide margin), you may not be able to identify the out-of-control points (Type II error). If the margin is wrongly too small, you may incorrectly declare some of the in-control points as out-of-control.

[@kassimolawale4223]

God bo as you bro

[@oyebanjitemilade]

Sorry pls I'm not still clear with how you get the Control constant

[@pauljoseph5301]

why did we took the value under 5 for A2?

[@joshemman]

Samples of size 5 were collected daily. See 1:10

[@harshavardhan-ee6jd]

Quality content

[@joshemman]

Thanks, Harsha.

[@orangetsh13]

Great job!!!

[@suddude7481]

Just super again

[@brudo5056]

Hello. It takes some time, sampling and processing to get to those UCL, LCL and mean value. So when you come to this situation like data point 5 is out of control then normally one cannot go on just like that but must consider what to do with this outlier and what to do with the limits... When (condition) and how (procedure of recalculation) to reset the new upper&lower control limits. Is there a video or clear procedure for available ?

[@joshemman]

The existence of an outlier signals an out-of-control system. Given that history cannot be rewritten, the outlier cannot be erased, and subsequent recalculations are not possible. Rather, the outlier serves as a clear indication that the system was not operating correctly. It prompts the need to pinpoint the responsible factors and proactively address the root cause for a more reliable and stable system.

[@ardrapriyadarsini946]

Thank you 🙏 😭

[@vinothsathiyavan8328]

If I am taking the daily 5 samples reading means, my LSL and USL will fluctuate. Then how to plot the values in daily basis(if am plotting daily avg values manually)

[@AhmedAhmed-uq1tg]

How did u find the values of A2?

[@samwelwafula628]

Brilliant.

[@abdullahalnoman582]

Thank you so much sir...

[@camilleroch3914]

Best vid, thanks!

[@wiremuherewini7875]

why choose sample size 5 why not the others? what makes you choose number 5

[@bhuwanupreti4207]

But how to maintain its on shopfoor. How to operator filled this limit

[@younesnaciri4926]

hi, how can we have n=1 ? Because in my SPC card, i have n=1 and i dont know why

[@KmJahid-yc5hr]

same data,range chart says process statistical in control, but mean chart says not..i am not clear...please explain sir

[@rhishishranjan4831]

What if sample size is uneven.

[@KKRISHNANEEE_]

clear one

[@sangeetaloachab5625]

Thnkyuuuu soo mucchhh sirr

[@evvvv2881]

Can we either choose to solve the UCL and LCL by using the mean or range or should go hand in hand because it may display different results in term variability, right ? Meaning variations that can be seen using the range cannot be seen using the mean

[@joshemman]

Yes. Mean is for variation in the centers; Range is for variation in the difference between minimum and maximum values.

[@evvvv2881]

Joshua Emmanuel Thank you 🙏 and your video is super brilliant, short and concise. It helped me a lot 😌

[@jenniferpereira1555]

thank you so much!!