# 1.2 Data, sampling, and variation in data and sampling  (Page 40/56)

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YouPolls is a website that allows anyone to create and respond to polls. One question posted April 15 asks:

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Lol stats...gotta love it lol
Explain standard deviation
A class of students took a math test. Their teacher found that the mean score on the test was an 85%. she then calculated the s.d of the other test scores and found a very small s.d which suggest that most students scored very close to 85%.
suhail
its real life example of S.D
suhail
thank you. how do we calculate standard deviation and variance
Carrington
bro search it by yourself on Google.
suhail
can you explain variance for me
Ammm, variance is the square of standard deviation, S.D a quantity expressing by how much the members of a group differ from the mean value for the group.
suhail
discuss random variables
A variable representing outcomes of a random experiment.
suhail
I am not able to understand Bayes theorm
Watch "Bayes' Theorem - The Simplest Case" on YouTube ***youtu.be/XQoLVl31ZfQ
jennifer
quartile 1= 4 and quartile = 12 then how we can find the value of median....?
who is father of statistics
Sir Ronald aylmer fisher
Bukola
what is meant by negative correlation between two variables
when one variable is increases another variable is decreases..
Korem
it is the inverse relationship between two variables.
abhinav
Thing of two variable x and y with xy co-ordinate. If increasing in the value of y, increase the value of x then the relation between the two variable is a positive correlation. Moreover, if increase in value of y gradually decrease the value of x then the relation is know as negative correlation
Akash
Out of 1600 families in a town there are 4 childrean in each family. What is the number of families would be expected to have. 1) Two boys and two girls 2) No boys 3) At least One boy?
3
Ak
3
Steve
3
bashir
3
Zaima
3
Hassan
3
Daymion
3
Someone send me a good introduction to statistics for data science. Am not from a math background
Assuming data on the past demand and probabilities are available how might a value be important for receiving perfect information and imperfect information?
with the aid of diagram explain hyper inflation
what is sampling
samples are drawn from the population. this processes is called sampling
Korem
what is median? simply define
I need to describe a bar graph with ordinal discrete data. The graph showed that highly agreed that stay at home moms have happier marriages 700, 400 sometimes agreed, and 100 disagreed. questions I had to answer is why is the meadian the best level of central tendency and what is the measurement of descrion.
One need to understand your question very well.
ben
sorry I need to find the best level of measurement, standard deviation, and level of dispersion.
Mary
Alright Mrs Smith
ben