 |
| Mathsisfun |
If a graph has normal distribution, then 68% of the results will be within 1 standard deviation and 95% of results will be within 2 standard deviations:
 |
| Biologyforlife |
The more centrally (around the mean) scattered they are then the more accurate the data is. If data is really spread out and there is only a small proportion of the data that is near the mean then it will have a large standard deviation, and will not be good data to draw conclusions from.
To work out standard deviation you add together all the deviations and then divide this by the number of values minus one.
To work out a deviation, first find the mean then subtract the it from a value. This answer needs to be squared to eliminate negative numbers. Do this for each value and then add them up. Divide this number by the number of values minus one. Find the square root.
You don't actually need to be able to do this according to the mark scheme, but it would seem wise to learn it.
For example, if I have 1, 2 and 3 and I want to work out the standard deviation I first find the mean
This is done by adding up all the values and dividing by the number of values you have (3):
1+2+3= 6
6/3=2
Next you need to subtract the mean from each value and square the answer:
1-2= -1
-1 squared= 1
2-2= 0
0 squared= 0
3-2= 1
1 squared= 1
Then add together all these answers:
1+0+1= 2
Now divide this by the number of values (3) minus one:
2/2= 0
Now find the square root of this:
the square root of 0= 0
So here one standard deviation is zero.
https://www.youtube.com/watch?v=hUaua15QzK4
https://www.youtube.com/watch?v=gV1gUdFvI54
But Dr. Itua, Traditional Herbal Practitioner in Africa, Have cured for HIV which is extracted from some rare herbals. It is highly potential to cure AIDS 100% without any residue. Dr Itua herbal medicine has already passed various blogs on how he use his powerful herbals to heal all kind of diseases such as. Herpes, HIV,,Cushing’s disease,Heart failure,Multiple Sclerosis,Hypertension,Colo_Rectal Cancer, Diabetes, Hepatitis,Hpv,Weak ErectionLyme Disease,Blood Cancer,Alzheimer’s disease,Bechet’s disease,Crohn’s disease,Parkinson's disease,Schizophrenia,Lung Cancer,Breast Cancer,Colo-Rectal Cancer,Blood Cancer,Prostate Cancer,siva.Fatal Familial Insomnia Factor V Leiden Mutation ,Epilepsy Dupuytren's disease,Desmoplastic small-round-cell tumor Diabetes ,Coeliac disease,Creutzfeldt–Jakob disease,Cerebral Amyloid Angiopathy, Ataxia,Arthritis,Amyotrophic Lateral Scoliosis,Fibromyalgia,Fluoroquinolone Toxicity,Brain Cancer,Breast Cancer,Lung Cancer,Kidney Cancer,Syndrome Fibrodysplasia Ossificans ProgresSclerosis,Seizures,Alzheimer's disease,Adrenocortical carcinoma.Asthma,Allergic diseases.Hiv_ Aids,Herpe ,Copd,Glaucoma., Cataracts,Macular degeneration,Cardiovascular disease,Lung disease.Enlarged prostate,Osteoporosis.Alzheimer's disease,
ReplyDeleteDementia.,Wart Remover,Cold Sore, Epilepsy, also his herbal boost immune system as well. I'm telling this because he uses his herbal medicine to cure me from hepatitis B and HIV, which i have being living for 9 months now with no side effect. The Herbal Medicine is just as good when drinking it although i have to use rest room after drinking it which I do not really care about because i just want to get the virus out of my body, I will recommend Dr Itua to anyone sick out here to contact Dr Itua with this following information.
Email...drituaherbalcenter@gmail.com /
Whatsapp Or Call...+2348149277967.
He might be late to respond because he always busy with patent, but he will surely get back to you with positive response.