You're so passionate about this. you sound relaxed and patient and your classes/videos helped and are still helping me understand stats. Be blessed and thank you so much.
1 A meteorologist interested in the consistency of temperatures in three cities during a given week collected the following data.the temperatures for the five days of week in three cities were
5:06 Sir, is the sample variance different from the population variance? I want to ask whether in machine learning to calculate variance and standard deviation on a dataset using sample variance and standard deviation?
@@lyka1237I already answered that for you, in statistics when you are in a profession like data science you deal with population and samples when n is used it is a large group of population and n-1 is when you dealing with a smaller range population (sample).if you still don't get it ask Google
@@funfeces3450 it's just the formula for it's called bessel formula. It's like asking why is the formula for mean used for finding the mean. It's just how it is
In calculating population standard deviation, you divide by N but for calculating sample standard deviation, you divide N-1 , the 1 is subtracted as our analysis is based on samples, this is done to avoid any biased nature of the collected samples.
Help please. A retailer observes that the demand for a popular board game averages 40 per week with the standard deviation of 13. If the seller wishes to have adequate stock 99% of the time, at least how many games must she keep on hand?
Confusion ooh but as for the ungrouped data u are correct but when u are solving for the grouped data u make a mistake,wen the total frequency is less than 30 u will maintain but if it's greater or equal 30 u will substrate by one. Plz it's applied for grouped data only
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You're so passionate about this. you sound relaxed and patient and your classes/videos helped and are still helping me understand stats. Be blessed and thank you so much.
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after this video I think it is really interesting mathematical thing to solve with tables.
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1 A meteorologist interested in the consistency of temperatures in three cities during a given week collected the following data.the temperatures for the five days of week in three cities were
5:06 Sir, is the sample variance different from the population variance? I want to ask whether in machine learning to calculate variance and standard deviation on a dataset using sample variance and standard deviation?
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What a very informative video.I have been following the steps ,im very impressed.
Great. Really well explained. Thanks
thanks for very informative and clear video. It helps a lot.
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Great. I'll definitely be watching your videos on pre calculus.
n-1 is for sample, n is for population
I'll complete all tutorials
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Can you do a Calculus BC review.
What do you call to this table
Classic interval | f | x | (x-mean) | (x-mean)² | rf | cf< | cf> | rcf |
Why did you use n-1 ( unbiased )and n at the same . Please could you advice on it?
I need a pros and cons list of the 2
nice one
Thanks a million
Why n-1 instead of n?
the n is for population and n-1 is for sample
@@_femme_force why n-1 instead of n
@@lyka1237I already answered that for you, in statistics when you are in a profession like data science you deal with population and samples when n is used it is a large group of population and n-1 is when you dealing with a smaller range population (sample).if you still don't get it ask Google
@@_femme_force he’s asking why minus 1 ? like why wouldn’t you minus 2 or 50 ?
@@funfeces3450 it's just the formula for it's called bessel formula. It's like asking why is the formula for mean used for finding the mean. It's just how it is
thanks
Why do some times they use n-1 and even EF wen calculating Variance 10:27am
Is it divided by 'n' OR is it 'n-1'? Think its n. Not sure about the reasoning behind n-1.
This becos when n is less 30 u will substrate by one and if n is greater or equal to 30 u will maintain it .note it's only apply for ungrounded data
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3:19 Sir, i want to ask, is the deviation with standard deviation different?
sir why we calculate frequency in it bcz without frequency the answer is also same
What Programm do you use as drawing Programm?
Why is there a variance sample? How many variance do we have?
I'm confused why we subtract 1 fron n tell me why?!
Thanks sir
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great!
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4:41 Why is 1 subtracted from n?
In calculating population standard deviation, you divide by N but for calculating sample standard deviation, you divide N-1 , the 1 is subtracted as our analysis is based on samples, this is done to avoid any biased nature of the collected samples.
Help please.
A retailer observes that the demand for a popular board game averages 40 per week with the standard deviation of 13. If the seller wishes to have adequate stock 99% of the time, at least how many games must she keep on hand?
Please why are we using n-1
Confusion ooh but as for the ungrouped data u are correct but when u are solving for the grouped data u make a mistake,wen the total frequency is less than 30 u will maintain but if it's greater or equal 30 u will substrate by one. Plz it's applied for grouped data only
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423
how are you not laughing when you say 69