Psychology 2010 Homework Assignment 1 4 pt. Due __One week from today______
This homework assignment gives you drill and practice in the use of some more data analysis “tools”. Specifically, the tools are graphical techniques and numeric summaries of characteristics of the data. Both types tell us about the three characteristics of data – central tendency, variability, and distribution shape.
A committee at a local university was recently appointed to come up with a new mascot. After days of deliberation two new mascots were decided upon. However, the committee could not decide which of the two would be more acceptable to the student body. So it was decided that the two proposals would be presented to two different groups of students. If there were a "significant" difference in approval, the proposal with the higher approval rating would be chosen. If there were no "significant" difference, the less expensive of the two would be used. A psychologist was chosen to conduct the study. Students were randomly chosen from the university's master student registration list. Half the students were shown the first proposal, Werlot, a take-off on the 1996 Olympic mascot. The other half were shown the second proposal, Goshzilla, a politically correct giant lizard inspired by the horror movies of a similar name. The data are below. Each score is a "Suitability Rating" on a scale of 1 to 100, with 100 representing the most favorable rating and 1 representing least favorable.
Describe the data
i. With dot plots – one for each group. Use the same axis labels for each group.
ii. With the statistics requested on the answer sheet. Compute them by hand. You should use SPSS or Excel to check your answer. Note that SPSS automatically computes the Standard deviation using the N-1 formula, but in Excel, you must select it as STDEV.S if you’re inserting a function. Turn in a separate sheet showing your hand computations.
The data are as follows:
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"Suitability"
StudentGroup Rating
30 Goshzilla79
23 Goshzilla84
12 Werlot94
15 Werlot91
24 Goshzilla81
29 Goshzilla74
21 Goshzilla81
22 Goshzilla78
25 Goshzilla75
7Werlot92
28 Goshzilla71
11 Werlot87
13 Werlot83
2Werlot92
26 Goshzilla67
"Suitability"
StudentGroup Rating
18 Goshzilla73
6Werlot83
4Werlot84
8 Werlot80
9 Werlot79
27 Goshzilla61
14 Werlot68
19 Goshzilla62
17 Goshzilla63
20 Goshzilla59
5Werlot73
10 Werlot68
16Goshzilla58
1Werlot70
3Werlot63
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The answer sheet is on the next page.
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Biderman's Psychology 2010
HA 3 answer sheet. 4 pt. Name ______
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A.
i. Dot plots.
Werlot
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Goshzilla
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ii. Descriptive StatisticsWerlotGoshzilla
Mean______
Median______
Standard DeviationN-1______
Range______
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