Hypothesis Testing for Zero Correlation | ExamSolutions

In this video I show you how to do hypothesis testing for zero correlation from a population by taking a sample of observations from the population calculating the product moment correlation coefficient (PMCC) for the sample and comparing it to a critical value found from tables. I look at three scenarios, which involve 1 tail and two tail tests.
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[@omdzikr8795]

What about working it out on a calculator

[@joshlivingstone3414]

Thank you, your videos are very clear and you include all the potential variants of how a question could be presented, instead of just one specific example!

[@ExamSolutions_Maths]

Your comment is appreciated. Thanks.

[@feyronin]

Perfectly explained with incredibly neat working and helpful tables. Thanks a lot!

[@ExamSolutions_Maths]

Thank you and love your name.

[@anagraham6341]

Great explanation thank you!!

[@JamesETHD]

thanks a lot this really helped

[@ExamSolutions_Maths]

You're welcome. Pleased to hear it helped.

[@mercyjepchumba2496]

Love ur accent

[@JafastAndJafurious]

Quick Question, how do you know when to do a two-tailed test and a 1 tail-test? Will the exam question be specific and tell us to do a two-tail test?

[@ExamSolutions_Maths]

Did you check out 13:06 ? One tail if it is > or < , two tail if it is not equal to. The question will generally ask you to test one or the other but if not you should be able to tell based on the question if the product moment for testing is a positive or negative value.

[@mercyjepchumba2496]

Thanks alot

[@ExamSolutions_Maths]

No problem. Thanks for watching.

[@joemarriage3002]

Is this still on the Pearson A-Level spec?

[@polVallverdu-mf9uk]

yeah

[@robsol9114]

How do you know wheter there is enough evidence or not?

[@GP-eq3gh]

Hi when can i get resources for the new spec a level maths?

[@ExamSolutions_Maths]

What resources are you after?

[@GP-eq3gh]

ExamSolutions meant to say “where” but for the new spec where can i get questions for vectors? Apart from the specimen papers are there anymore?

[@ExamSolutions_Maths]

Only what you currently see on the website, under the vectors section. They link back to old papers. There is not much yet available for the new spec as there has not been many exams.

[@chakshita1]

How do you calculate PMCC? Or will it be given every time?

[@ExamSolutions_Maths]

You can see it here www.examsolutions.net/tutorials/measuring-linear-correlation/?level=A-Level&board=Edexcel&module=Statistics%20A-Level&topic=1844

[@gm836]

It should be given normally

[@n1984ster]

why have you not used t-test here?

[@alialmeerahmed6994]

My guy