This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Are b or r significantly greater than 0? o For now, we only need one test- If r is significantly greater than 0, then b will be too o Null and alternative hypotheses H : =0 H 1 : o We use a t-test, so find t critical , with df=n-2 o Calculate t: t = r r2 1 / 2--n <- r 2 o If t calculated >t critical , reject H o Example 2 tailed n = 500 H0: =0 r = .40 H1: df = n-2 = 498 t = r 2 / 2 r q n--t critical = 1.96 = .4 84 . / 498 = .4(24.3) = 9.7 REJECT the null hypothesis; the correlation is statistically significant...
View Full Document
- Spring '09