a-researcher-wants-to-investigate-whether-there-is-a-significant-difference-in-t

Question

A researcher wants to investigate whether there is a significant difference in the resting heart rates in beats per minute of individuals before and after a $6$ -week exercise program. The paired data below represent the heart rates of $8$ participants before and after the program.

Construct a $95$ percent confidence interval for the mean difference in heart rates Before minus After. What does it suggest about the effect of the exercise program?

Accepted Answer

(1.86,3.39)(1.86, 3.39)It suggests the program significantly reduced heart rates.

Answer

(–1.00,1.00)(–1.00, 1.00)It suggests no significant change.

Answer

(0.25,4.25)(0.25, 4.25)It suggests a large and uncertain effect.

Answer

(2.00,5.00)(2.00, 5.00)It suggests overestimated reduction