Dr.Johnson is studying the effects of aspirin on heart rate.He believes that aspirin will lower heart rate.He has 2 groups the treatment group receives 80mg of aspirin for a week (n=4) the control group received a placebo (n=4) and their heart rates are compared.Below is his data in which heart rate is beats per minute.He sets his alpha level at 0.05 and uses a directional test. 
What is Dr.Johnson's critical t-value?
Definitions:
First Immigrant
The term often refers to the earliest individuals or groups to settle in a new land or country.
Trans-National America
A concept referring to the United States as a nation influenced by multiple cultures and ethnicities, transcending traditional national boundaries.
Randolph Bourne
An American intellectual and essayist who critiqued US participation in World War I and is best known for his essay "Trans-National America."
Mexican Immigration
The movement of people from Mexico to other countries, especially the United States, for various reasons including economic, family reunification, and political.
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