Is the right arm or left arm stronger? Twenty five right handed people were studied. They were asked to do as many bicep curls as possible, first with their right arm and then with their left arm. Note:The differences were calculated as right-left.
The 95% confidence interval for the true mean difference is (-9.242, 0.2472). Which of the following statements is the correct interpretation?
A. There is convincing evidence that the right arm can perform, on average, a different number of curls than the left arm.
B. There is not enough evidence to say that the right arm and left arm can perform a different number of curls on average.
C. The right arm can perform more bicep curls than the left arm.
D. The left arm can perform more bicep curls than the right arm.