We are here with you hands in hands to facilitate your learning & don't appreciate the idea of copying or replicating solutions. Read More>>

www.vustudents.ning.com

Looking For Something at vustudents.ning.com? Click Here to Search

 www.bit.ly/vucodes + Link For Assignments, GDBs & Online Quizzes Solution www.bit.ly/papersvu + Link For Past Papers, Solved MCQs, Short Notes & More

# Sta301 Graded Discussion Board Opening Date 03-02-2015 .... closing date 04-02-2015

Sta301 Graded Discussion Board Opening Date 03-02-2015 .... closing date 04-02-2015

Share ur views and ideas here and discuss also...!!!

Why range is not considered as a good measure of variability? Why standard deviation is preferred over the other measures?”
Post your comments after inferring the above topic. Your comments should NOT exceed from 250 words.
Note: Discussion should be relevant. Irrelevant and unnecessary lengthy materials will not be considered. Also it is strictly informed that comments will not be received through emails

plz discuss here

+ How to become Top Reputation, Angels, Intellectual, Featured Members & Moderators?

+ VU Students Reserves The Right to Delete Your Profile, If?

See Your Saved Posts Timeline

Views: 2846

.

+ http://bit.ly/vucodes (Link for Assignments, GDBs & Online Quizzes Solution)

+ http://bit.ly/papersvu (Link for Past Papers, Solved MCQs, Short Notes & More)

+ Click Here to Search (Looking For something at vustudents.ning.com?)

+ Click Here To Join (Our facebook study Group)

### Replies to This Discussion

Range And SD

The standard deviation and range are both measures of the spread of a data set. Each number tells us in its own way how spaced out the data are, as they are both a measure of variation. The range relies on a very simple formula of subtracting the minimum data value from the maximum. The standard deviation is a more reliable measure of variation, and is less susceptible to outliers, however the calculation for the standard deviation is more involved than that of the range. Although there is a not an explicit relationship between the range and standard deviation, there is a rule of thumb that can be useful.

Accurate Solution Para For GDB

Standard deviation makes use of all data to calculate the spread of data from average while range only uses two data ie the largest value data and the smallest value data, so standard deviation is a more accurate measure.

In addition, standard deviation measures the spread of data from the MEAN while range measures only the two extreme values ie the difference between the largest value and smallest value data.

Thirdly, standard deviation can be used in the statistical analysis eg hypothesis testing.

Fourthly, standard deviation gives weightage to the deviation of the data from the mean by squaring it ie the greater the deviation, the greating the weightage after the squaring.

Fifthly, standard deviation gives weightage to the positive and negative deviation of the data from the mean too.

Hence, Standard deviation is a more precise measure of spread of data as compared to the rudimentary range measure of the spread of data.

SD's has the following values due to which its best then others variables....

1) It is rigidly defined.

2) It is based on all the observations of the series and hence it is representative.

3) It is amenable to further algebraic treatment.

4) It is least affected by fluctuations of sampling.

there are three measure of variability range, inter quartile range and standard deviation. now what is that reason that standard deviation is more preferable among these three methods/

The range is the difference between the largest and smallest values in a set of values.

For example, consider the following numbers: 1, 3, 4, 5, 5, 6, 7, 11. For this set of numbers, the range would be 11 - 1 or 10.

Basically, because the range of a set of data is completely determined by just two of them -- the min and the max values. As long as all the other values stay between those two bounds, the range stays the same.

The std. dev. on the other hand, depends on every value in the dataset.

For example, if a set of 100 data consists of 10 and 50, with all the rest of them between 24 and 26, the range will be 40; the semi-range, 20. The std. dev. will be close to 1, however.

Then if another set of 100 consists of the same extremes: 10 and 50; but the rest of them are scattered evenly between those extremes, the semi-range is still 20; but now, the std. dev. will be a lttle more than 10.

Another example:
If you have two datasets, both normally distributed with the same std. dev., but one with 100 times as many data as the other, then the larger dataset will tend to have a much larger range than the smaller one; but both have the same variability.

## Latest Activity

saniya gul joined + M.Tariq Malik's group

### STA630 Research Methods

1 hour ago
saniya gul joined + M.Tariq Malik's group

### PSY502 History & Systems of Psychology

1 hour ago
saniya gul joined + M.Tariq Malik's group

### PSY405 Personality Psychology

2 hours ago
saniya gul joined + M.Tariq Malik's group

### PSY101 Introduction to Psychology

2 hours ago
saniya gul joined + M.Tariq Malik's group

### PSY404 Abnormal Psychology

2 hours ago
3 hours ago
Hadi updated their profile
4 hours ago
4 hours ago
4 hours ago
+ !♛Abee Smarty ♛!+ liked moniba hussain's blog post love
4 hours ago
+ !♛Abee Smarty ♛!+ liked moniba hussain's blog post fun
4 hours ago
4 hours ago
4 hours ago
4 hours ago
+ !♛Abee Smarty ♛!+ liked + "αяsαℓ " Ќąƶµяɨ •"'s blog post چھوٹا کام
4 hours ago
+ !♛Abee Smarty ♛!+ liked ++"S.M.TALHA"++'s blog post کی جاناں میں کون
4 hours ago
4 hours ago
+ !♛Abee Smarty ♛!+ liked +++STUDENT+++'s blog post Depression
4 hours ago
4 hours ago

## Today Top Members

1

2

3

### ϝ ι ყ α

© 2019   Created by + M.Tariq Malik.   Powered by