A researcher is interested in seeing if negative political ads against an opponent (group one) are more persuasive than positive ads for an original candidate (group two). She creates a scale to measure how persuasive the ads are; larger numbers mean more persuasive.

She collects the following data

• Group One (Negative ads): x1= 7.13, s21=s12= 2.73, n₁ = 20
• Group Two (Positive ads):x2=2= 9.25, s22=s22= 4.8, n₂ = 20

1. What is the t-statistic for this test
2. What the degrees of freedom for this set?
3. What is the standard deviation for group two?
4. What can be said about the significance of the study?