study was conducted to assess whether there is a difference in blood oxygen saturation values (SpO2) in groups of patients with sleep apnea and without. Groups of healthy participants and patients with sleep apnea were enrolled in the study. The SpO2 measurements are given in the following table.

Patient group

SpO2, %

Apnea patients (group 1)

9294959892989394929291939294

Healthy participants (group 0)

959297959696989794969794

a)(0.5 p)Are the data paired or unpaired? Justify your answer.

b)(0.5 p)Find the 95% confidence interval for the difference of the means.

c)(1 p)Perform the hypothesis test (significance level = 0.05). Interpret the obtained p-value.