Writing Errands

(a) Make an Excel scatter plot. What does it suggest aboutthe population correlation between X and Y? (b) Make an Excel worksheet to calculate SSxx , SSyy , andSSxy . Use these sums to calculate the sample correlation coefficient. Check your work by using Excel’sfunction =CORREL(array1,array2). (c) Use Appendix D to find t.05 for a two-tailed test for zero correlation.(d) Calculate the t test statistic. Can you reject ρ = 0? (e) Use Excel’s function =TDIST(t,deg_freedom,tails)to calculate the two-tail p-value.

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