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# S3 regression watch

1. https://i.imgur.com/7OHBACB.jpg
can someone explain what do they mean by testing the significance of r and how would I test it?
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2. (Original post by assassinbunny123)
https://i.imgur.com/7OHBACB.jpg
can someone explain what do they mean by testing the significance of r and how would I test it?
Its simple hypothesis testing.

U identify the critical region using ur data tables, then u see if ur test statistic, for r lies in the critical region.

If r lies in critical region then the result is significant so u can reject H0.

If r does not lie in critical region then result is not significant so u can accept H0.
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3. for any set of paired data there will be an r value. even if it is just random numbers written down by a computer. to decide if the correlation strength is non-random we say that r must be bigger than a certain amount; this amount depends on the sample size and your confidence level.
4. (Original post by Shaanv)
Its simple hypothesis testing.

U identify the critical region using ur data tables, then u see if ur test statistic, for r lies in the critical region.

If r lies in critical region then the result is significant so u can reject H0.

If r does not lie in critical region then result is not significant so u can accept H0.
ok thanks. also is null hypothesis always p=0 for these questions. and if alt hypo is p not =0 then it's a 2 tailed test and if alt hypo is p>0 then it's a one tailed test?
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5. (Original post by assassinbunny123)
ok thanks. also is null hypothesis always p=0 for these questions. and if alt hypo is p not =0 then it's a 2 tailed test and if alt hypo is p>0 then it's a one tailed test?
Yep.
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