Answer Happy

A researcher would like to determine if brief aerobic dancing is
a more effective treatment than the standard bicycling regimen for
elderly persons. The researcher measures heart rate recovery (HRR),
where lower HRR scores indicate better fitness. Nine persons
volunteered for the study, giving their HRR scores after a month of
bicycling, and again after a month of aerobic dance exercise. The
researcher predicted lower heart rate recovery scores following
dance---and hence better fitness. Below are the heart rate recovery
scores for each treatment condition.
Which of the following are the correct statements of the null
and alternate hypotheses, H0 and
HA ?
H0: µ1 = µ2 and
HA: µ1 µ2
H0: µ1 µ2 and
HA: µ1 = µ2
H0: µ1 > µ2 and
HA: µ1 µ2
H0: µ1 µ2 and
HA: µ1 > µ2
Participant
Pre-Treatment – Bicycling
Treatment 1
After Dance Regimen
Treatment 2
1
4
2
2
7
1
3
5
1
4
7
5
5
2
3
6
8
5
7
8
6
8
9
7
9
6
1
H0: µ1 < µ2 and
HA: µ1 µ2
H0: µ1 µ2 and
HA: µ1 < µ2