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(See Solution) Use a significance level of α = 0.05 Data set 25 in appendix b includes pairs of data for the sunspot number and the number of US car sales for

Question: Use a significance level of α = 0.05

Data set 25 in appendix b includes pairs of data for the sunspot number and the number of US car sales for 21 different years. Excel was used to find that the value of the linear correlation coefficient is r= -0.284.

  1. Is there a significant linear correlation between the sunspot number and the number of US car sales? Explain
  2. What proportion of the variation in the number of US car sales can be explained by the variation in the sunspot number?

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