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Find the whether the given correlation is significant at given level of significance.
(A) Is sample correlation coefficient r= 0.820 significant at =0.01level based on a sample size of n = 7data pairs? What about n =9 data pairs?
(B) Is a sample size correlation coefficient r =0.40 significant at = 0.05 level Based on sample size of n=20 data pairs? What about n=27 data pairs?
(C) Is it true that in order to be significant, an r-value must be larger than 0.90? Larger than 0.70? Larger than 0.50? What does sample size have to do with the significance of r? Explain.
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