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radhika bhandari

radhika bhandari

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can nyone make me clear about significance in t-test??? and confidence level???? u can link significance in t test to question no.1 c(ii) may june 2010 variant 53
 

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J

Jinosupreme

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NEED HELP!

I am a bit confused with Degree of Freedom,
When do we use n-1? When do we use (n-1)+(n-1)? Help please guys :)
 
daredevil

daredevil

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Jinosupreme said:
NEED HELP!

I am a bit confused with Degree of Freedom,
When do we use n-1? When do we use (n-1)+(n-1)? Help please guys :)
Click to expand...
when u hav 1 set of sample to experiement then u use (n-1)

if u have more than 1 then u use (n-1)+(n-1)

Basically like if u have to find out if the fur colour is affected by pollution (just as a random example.. not an educated one :p ) then u use (n-1) because it is only one group of rabbits that u are using....


but if u are comparing e.g. the size of leaves of a) leaves growing in shade; and b) leaves exposed to sunlight then u use (n-1)+(n-1) to calculate the degree of freedom for that set of calculations... i hope u get it.... tell me if u don;t :)
 
J

Jinosupreme

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daredevil said:
when u hav 1 set of sample to experiement then u use (n-1)

if u have more than 1 then u use (n-1)+(n-1)

Basically like if u have to find out if the fur colour is affected by pollution (just as a random example.. not an educated one :p ) then u use (n-1) because it is only one group of rabbits that u are using....


but if u are comparing e.g. the size of leaves of a) leaves growing in shade; and b) leaves exposed to sunlight then u use (n-1)+(n-1) to calculate the degree of freedom for that set of calculations... i hope u get it.... tell me if u don;t :)
Click to expand...

Does that mean Chi Squared test is more likely to use (n-1)+(n-1) as it is comparing 2 mean value of 2 sets of data? Umm what about T test? :)
 
U

UsMAn_U7

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What they mean when they say there isno overlap between datas ? I have come across this many times in many marking schemes
 
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