Edexcel BIOLOGY Doubts!!!!

[moon]

ok thanx

[MKh]

Thanks a lotz buddy ...but how 2 interpret d results of such a test? Thanks again!

[Hissa]

Increasing data reliability

Both dendrochronology and peat bog dating are used to confirm radicocarbon dating in a process known as "wiggle matching".
For example, wood of known ages from ancient trees, or samples of peat bog where the age is known from evidence of flood,etc, are dated from radiocarbon measurements and the results compared to give a form of calibration. This gives scientists clear reference points which they can use to determine the accuracy of the estimations of age, making the data considerably more reliable.

I do not get anything from the previous paragraph can anyone plz explain briefly what is meant..

[-Cornea]

guys i cn't find the a.s pprs:s

[Master_Key]

guys i cn't find the a.s pprs:s

You can get them of FEP.

[-Cornea]

please help me to find them :s

[Weaam]

please help me to find them :s

https://studentforums.biz/pastpapers/edexcel-new-syllabus-biology-physics-chemistry-pastpapers!!!!!!!/

 You'll find all the past papers you need here, with mark schemess

[-Cornea]

Thanks weaam<3 I appreciate it

[Weaam]

Thanks weaam<3 I appreciate it

ur welcomee

[-Cornea]

Guys from where do i get the examiners report if anyone can email me it :s

[Amelia]

Guys from where do i get the examiners report if anyone can email me it :s

Try this Link - http://www.scribd.com/doc/29420796/Edexcel-Biology-6BIO4-January-2010-Examiner-s-Report

[hissyfit]

 How to justify validity +reliability of results?
This might sound like a stupid question,but I m not sure how to tackle this for a lab report.I did a searh on google+TSR+SF & found nothing.


For the reliability I have come up with this : The experiment was repeated twice making the results more reliable.

To justify the validity,I ve no clue how to word it.
This is for the effect of heat on membranes.

Rep for your help.
Thanks

[Amelia]

How to justify validity +reliability of results?
This might sound like a stupid question,but I m not sure how to tackle this for a lab report.I did a searh on google+TSR+SF & found nothing.


For the reliability I have come up with this : The experiment was repeated twice making the results more reliable.

To justify the validity,I ve no clue how to word it.
This is for the effect of heat on membranes.

Rep for your help.
Thanks

Validity refers to the technique and apparatus used for collecting the data. A valid experiment is one that fairly tests the hypothesis. In a valid experiment all variables are kept constant apart from those being investigated, all systematic errors have been eliminated and random errors are reduced. Reliability refers to repeatability or consistency of results. In terms of second hand sources reliability refers to how trustworthy the source is.

[Weaam]

How to justify validity +reliability of results?
This might sound like a stupid question,but I m not sure how to tackle this for a lab report.I did a searh on google+TSR+SF & found nothing.


For the reliability I have come up with this : The experiment was repeated twice making the results more reliable.

To justify the validity,I ve no clue how to word it.
This is for the effect of heat on membranes.

Rep for your help.
Thanks

To make an experiment valid, measuerments have to be accurate meaning that the apparatus need to be the most accurate ones available, also variables need to be controlled, for the effect of heat on cell membranes the variables that need to be controlled inculde pH, Concentration and volume of solution. This is what i got from my bio teacher 

[hissyfit]

Do any of you have any tips for analysing graphs,some tips can I got from here: http://www.thestudentroom.co.uk/showthread.php?p=26347179&highlight=graph
,but if you have anything to add,that would be great.
+rep