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.
Can you reject the null hypothesis and concluded that aspirin lowers heart rate?
A)Yes,since the calculated t is greater than the table t
B)No,since the calculated t is greater than the table t
C)more information is necessary
D)None of these

Question

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. 
Can you reject the null hypothesis and concluded that aspirin lowers heart rate?
A)Yes,since the calculated t is greater than the table t 
B)No,since the calculated t is greater than the table t 
C)more information is necessary 
D)None of these

Quizplus · Accepted Answer

The calculated t-value is -2.96 and the table t-value for a directional test with alpha level 0.05 and 6 degrees of freedom is -1.943. Since the calculated t-value is greater than the table t-value, we can reject the null hypothesis and conclude that aspirin lowers heart rate.

DrJohnson Is Studying the Effects of Aspirin on Heart Rate