total, 16 patients were enrolled in the study. Values of the f-wave frequency during day- and night-time are given in the table below.

Time of the day

Aggregation values

Day-time (n= 16)

6.23

6.91

6.35

6.29

6.45

6.30

6.60

6.54

6.64

6.90

6.11

7.28

6.93

7.89

7.21

6.90

Night-time (n= 16)

6.41

5.98

6.25

6.03

6.57

6.25

6.51

6.50

6.50

6.41

6.70

6.03

6.60

6.77

6.88

6.93

Data analysis.

1. Summarize the data.

(decide which sampling technique was used to collect the data;

check if the data is normally distributed and if the variances of the groups are similar;

present data graphically; briefly interpret the results)