Pei Hwa Presbyterian Primary

[ruaqt2]

Jennifer:

Off topic:

Do you know the difference between \"a fair experiment\" vs \"a reliable experiment\"? This is reference to one of the qns in P5 SA2 last year.

Hi Jennifer

I got this from this website, http://explorable.com/definition-of-reliability.html. Hope it helps.

The Definition of Reliability Vs. Validity

Reliability and validity are often confused, but the terms actually describe two completely different concepts, although they are often closely inter-related. This distinct difference is best summed up with an example:

A researcher devises a new test that measures IQ more quickly than the standard IQ test:

If the new test delivers scores for a candidate of 87, 65, 143 and 102, then the test is not reliable or valid, and it is fatally flawed.

If the test consistently delivers a score of 100 when checked, but the candidates real IQ is 120, then the test is reliable, but not valid.

If the researcher's test delivers a consistent score of 118, then that is pretty close, and the test can be considered both valid and reliable.

Reliability is an essential component of validity but, on its own, is not a sufficient measure of validity. A test can be reliable but not valid, whereas a test cannot be valid yet unreliable.

Reliability, in simple terms, describes the repeatability and consistency of a test. Validity defines the strength of the final results and whether they can be regarded as accurately describing the real world.

Read more: Definition of Reliability - The Scientific Method

[S6169]

Jennifer:

Off topic:

Do you know the difference between \"a fair experiment\" vs \"a reliable experiment\"? This is reference to one of the qns in P5 SA2 last year.

IMO:
A fair experiment: referring to the design of a experiment . eg.whether an appropriate control has been set for the experiment to ensure the result is valid.
A reliable experiment: referring the procedure of a experiment. whether the result is repeatable.

Recently, my son's science homework also got a similar Q asked about why the person need to repeat one of the experiment three times. The answer is to ensure the reliable of the result.

[Jennifer]

S6169:

Jennifer:

Off topic:

Do you know the difference between \"a fair experiment\" vs \"a reliable experiment\"? This is reference to one of the qns in P5 SA2 last year.

IMO:
A fair experiment: referring to the design of a experiment . eg.whether an appropriate control has been set for the experiment to ensure the result is valid.
A reliable experiment: referring the procedure of a experiment. whether the result is repeatable.

What you wrote above is absolutely correct. Last year P5 SA2 one model ans was wrong.

[Jennifer]

dyh:

I have also put the SC P5 SA2 out of my mind already.

I still keep that SA2 paper. Will bring it along to see this year Science teacher during the Meet the Parents session.

[JRLam]

[quote="dyh]Sounds promising then. He is in charge of the E2K science enrichment program. Seems like PH is offered this program for the first time this year. It is only offered to selected schools and is a collaboration with the MOE GEP branch. You can read more about the E2K by doing a search in this forum for "E2K". It has been discussed by other parents from other schools at length.[/quote]


Hi dyh, can you advise the url to the thread discussing the E2K? I tried to search but nil results?

[iRabbit]

JRLam,


Here it is

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=8&t=8275

[IJJ]

Willow:

I hope the new sci HOD.....

Great news to celebrate :rahrah: :rahrah: :rahrah:

I hope the new one will be a great one!

What happened to the ex one? Headhunted somewhere else or kicked out?

[Jennifer]

IJJ:

What happened to the ex one?

Still seen in school.

[dyh]

IJJ:

Willow:

I hope the new sci HOD.....

Great news to celebrate :rahrah: :rahrah: :rahrah:

I hope the new one will be a great one!

What happened to the ex one? Headhunted somewhere else or kicked out?

Ouch! That's a little too harsh? :imanangel: I hope he is not reading this. He has his good points too. He is still a form teacher of one class. And maybe he is still HOD (external) too. Because the new one has title as \"HOD (internal)\".

[Jennifer]

dyh:

And maybe he is still HOD (external) too. Because the new one has title as \"HOD (internal)\".

:? internal, external - what do these mean?