Participant ID
1
2
3
4
5
Weekdays
Exercise
(min)
40
80
75
60
45
Mean=60,
SD=15.8
Sleep
(hours)
7
9
8
7
8
Mean=7.8,
SD=0.7
Weekends
Exercise
(min)
65
45
75
80
50
Mean=63,
SD=13.6
Sleep
(hours)
7
8
6
9
7
Mean=7.4,
SD=1.0
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1) Find out the correlation coefficient between hours spent on exercise and hours of sleep
during weekdays and weekends, respectively. Show your work.
2) On what days (weekdays or weekends), hours spent on exercise is more strongly
correlated with hours of sleep? Why?
3) The same group of participants all decided to extend 20 minutes of exercise everyday
during weekdays and double the amount of their exercise time on the weekend.
However, they found out their sleep time still remained the same. Calculate the new
correlation coefficients for both groups and explain how it differs from the previous
