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Do you remember the examples they gave for various industries? Was it sport clubs?

Thanks thats really helpful. One more thing im stuck on is that im confused whether how up to date a source/information is relates to validity or reliability? So if a source was upsated yesterday be more reliable or more valid than a similar source/information that was updated, say 20 yrs ago...

Hi guys, I understand how to define reliaibility and validiity regarding experiments but how do you define reliability and validity concerning information? For validity is it how qualified the author of the information is? Im rly confused especially about the validity bit and I have an...

So would you solve these roots of unity questions different to any other question like find fourth roots of 2+2i? And sorry I still dont understand how roots of unity relates to the original question in my first post, can someone explain?

So is z^n=1 or -1 the only type of 'roots of unity' questions?

Think so. Or z^n=-1? Not too sure

Ex 2.4 q6 is "factorise z^3-1. If z is one of the cube roots of unity, find the two possible values of z^2+z+1. " the solutions do z=1, z^2+z+1=3. Z not equal to 1, z^ +z+1=0. I dont rly understand how the roots of unity relate to the question, can someone explain?