Seasonal affective disorder (SAD) is a ight used to improve mood. or at night (t

Question

Seasonal affective disorder (SAD) is a ight used to improve mood. or at night (these are the times thought to be most effective for light therapy) All participants rated their mood follwing this therapy on a scale from 1 (poor mood) to 9 Cimproved affective disorder (SAD) is a type of depression during seasons with less daylight (e.g, winter months). One therapy for SAD is phototherapy, which is increased exposure to t atients to different intensities of ight (low, medium, high) in a ight box, either in the moming A researcher tests this therapy by exposing a sample of SAD patients to different int mood). The hypothetical results are given in the following table MomingS Time of Day Night te the F-table and make a decision to retain or reject the mull hypothesis for each hypothesis test. (Round your answers to two decimal places. Assume (a) Complet expermentwise alpha al to o.os.) Type here to search

Explanation / Answer

Answer:

Two factor ANOVA

Intensity

Means:

low

medium

high

Morning

5.5

6.5

7.2

6.4

Time

Night

5.3

7.2

7.2

6.6

5.4

6.8

7.2

6.5

6

replications per cell

ANOVA table

Source

SS

   df

MS

F

   p-value

Time

0.25

1

0.25

0.11

.7436

Intensity

20.72

2

10.36

4.52

.0193

Interaction

1.17

2

0.58

0.25

.7772

Error

68.83

30

2.29

Total

90.97

35

Two factor ANOVA

Intensity

Means:

low

medium

high

Morning

5.5

6.5

7.2

6.4

Time

Night

5.3

7.2

7.2

6.6

5.4

6.8

7.2

6.5

6

replications per cell

ANOVA table

Source

SS

   df

MS

F

   p-value

Time

0.25

1

0.25

0.11

.7436

Intensity

20.72

2

10.36

4.52

.0193

Interaction

1.17

2

0.58

0.25

.7772

Error

68.83

30

2.29

Total

90.97

35

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.