The authors of the paper ?Influence of Biofeedback Weight Bearing Training in Sit to Stand to Sit and the Limits of Stability on Stroke Patients? (The Journal of Physical Therapy Science [2016]: 3011?2014) randomly selected two samples of patients admitted to the hospital after suffering a stroke. One sample was selected from patients who received biofeedback weight training for 8 weeks and the other sample was selected from patients who did not receive this training. At the end of 8 weeks, the time it took (in seconds) to stand from a sitting position and then to sit down again (called sit-stand-sit time) was measured for the people in each sample. Data consistent with summary quantities given in the paper are given below. For purposes of this exercise, you can assume that the samples are representative of the population of stroke patients who receive the biofeedback training and the population of stroke patients who do not receive this training.

a. Use the given data to estimate the mean sitstand-sit time for stroke patients who receive biofeedback training.

b. Use the given data to estimate the mean sitstand-sit time for stroke patients who do not receive biofeedback training.

c. Use the given information to estimate the standard deviation of sit-stand-sit times for stroke patients who receive biofeedback.

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Biofeedback Group 2.6 4.3 2.1 1.9 3.2 3.5 2.8 2.7 4.1 3.2 4.0 3.5 3.5 2.3 3.1 No Biofeedback Group 5.1 4.7 3.9 3.4 4.2 4.2 4.7 4.0 5.1 4.4 5.1 4.2 4.3 3.4 3.9