Question

Seasonal 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 light used to
improve mood. A researcher tests this therapy by exposing a sample
of patients with SAD to different intensities of light (low,
medium, high) in a light box, either in the morning or at night
(these are the times thought to be most effective for light
therapy). All participants rated their mood following this therapy
on a scale from 1 (*poor mood*) to 9 (*improved
mood*). The hypothetical results are given in the following
table.

Light Intensity | ||||
---|---|---|---|---|

Low | Medium | High | ||

Time
of Day |
Morning | 5 | 5 | 7 |

6 | 6 | 8 | ||

4 | 4 | 6 | ||

6 | 7 | 9 | ||

5 | 9 | 5 | ||

6 | 8 | 8 | ||

Night | 5 | 6 | 9 | |

8 | 8 | 7 | ||

6 | 7 | 6 | ||

6 | 5 | 8 | ||

4 | 9 | 7 | ||

3 | 7 | 6 |

(a) Complete the *F*-table and make a decision to retain
or reject the null hypothesis for each hypothesis test. (Round your
answers to two decimal places. Assume experimentwise alpha equal to
0.05.)

Source of Variation |
SS |
df |
MS |
F |
---|---|---|---|---|

Time of day | ||||

Intensity | ||||

Time
of day × Intensity |
||||

Error | ||||

Total |

State the decision for the main effect of the time of day.

Retain the null hypothesis.Reject the null hypothesis.

State the decision for the main effect of intensity.

Retain the null hypothesis.Reject the null hypothesis.

State the decision for the interaction effect.

Retain the null hypothesis.Reject the null hypothesis.

(b) Compute Tukey's HSD to analyze the significant main effect.

The critical value is for each pairwise comparison.

Summarize the results for this test using APA format.

Answer #1

(a) Complete the *F*-table and make a decision to retain
or reject the null hypothesis for each hypothesis test. (Round your
answers to two decimal places. Assume experimentwise alpha equal to
0.05.)

Source |
SS |
df |
MS |
F |

Time of day | 0.25 | 1 | 0.25 | 0.12 |

Intensity | 22.17 | 2 | 11.08 | 5.21 |

Time
of day × Intensity |
0.50 | 2 | 0.25 | 0.12 |

Error | 63.83 | 30 | 2.13 | |

Total | 86.75 | 35 |

State the decision for the main effect of the time of day.

Retain the null hypothesis.

State the decision for the main effect of intensity.

Reject the null hypothesis.

State the decision for the interaction effect.

Retain the null hypothesis.

(b) Compute Tukey's HSD to analyze the significant main effect.

The critical value is **1.47** for each pairwise
comparison.

Seasonal 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 light used to
improve mood. A researcher tests this therapy by exposing a sample
of patients with SAD to different intensities of light (low,
medium, high) in a light box, either in the morning or at night
(these are the times thought to be most effective for light
therapy). All participants rated...

Seasonal 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 light used to
improve mood. A researcher tests this therapy by exposing a sample
of patients with SAD to different intensities of light (low,
medium, high) in a light box, either in the morning or at night
(these are the times thought to be most effective for light
therapy). All participants rated...

Seasonal 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 light used to
improve mood. A researcher tests this therapy by exposing a sample
of patients with SAD to different intensities of light (low,
medium, high) in a light box, either in the morning or at night
(these are the times thought to be most effective for light
therapy). All participants rated...

We use SPSS but I could not figure out that last one
Seasonal 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 light used to
improve mood. A researcher tests this therapy by exposing a sample
of SAD patients to different intensities of light (low, medium,
high) in a light box, either in the morning or at night (these are
the times...

learn tricks. She studies a sample of dolphins from Sea World
and randomly assigns individuals to one of three food motivation
conditions: low, moderate or high. The level of food motivation
corresponds to the type of food given to the dolphins during
training: a low-preference food, a moderately-preferred food, or a
highly-preferred food. Dolphins are trained to jump through hoops
in their pool and are rewarded with one of the three types of food.
The trainer then measures the number...

PSYC 220: Homework 4
Note: In the case of decimals, round to the nearest hundredths
place (ex: 9.37)
1. Alpha is the probability of committing a Type I Error if…
a. The null distribution is true
b. The null distribution is false
c. n is larger than 30
d. the alternative distribution is true
2. We are more likely to reject the null as…
a. Alpha goes down
b. n goes down
c. variation goes down
d. the difference between...

Enter the hypothetical data below in SPSS to use for the
assignment. The SPSS commands: 'file', 'new', 'data' will create a
spreadsheet in which to enter the data below (manually).
Case Group
Test
1
1
6
2
1
7
3
1
5
4
1
4
5
1
1
6
2
3
7
2
5
8
2
2
9
2
5
10
2
1
The groups are coded as follows: 1=experimental group, 2 control
group. The participants in the experimental...

The table below shows the number of hours per day 11 patients
suffered from headaches before and after 7 weeks of soft tissue
therapy. At alphaαequals=0.01,
is there enough evidence to conclude that soft tissue therapy
helps to reduce the length of time patients suffer from headaches?
Assume the samples are random and dependent, and the population is
normally distributed. Complete parts (a) through (f).
Patient Daily headache hours (before)
Daily headache hours (after)
1 3.1 2.4
2 1.8 2.2...

A researcher claims that a post-lunch nap decreases the amount
of time it takes males to sprint 20 meters after a night with only
4 hours of sleep. The table shows the amounts of time (in seconds)
it took for 10 males to sprint 20 meters after a night with only 4
hours of sleep when they did not take a post-lunch nap and when
they did take a post-lunch nap. At
alphaαequals=0.01,
is there enough evidence to support the...

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