At LLD Records, some of the marketresearch of college students is done during pr
ID: 2914877 • Letter: A
Question
At LLD Records, some of the marketresearch of college students is done during promotions on collegecampuses, while other market research of college students is donethrough anonymous mail, phone, internet, and record storequestionnaires. In all cases, for each new CD the company solicitsan "intent-to-purchase" score from the student, with 0 being thelowest score ("no intent to purchase") and 100being the highestscore ("full intent to purchase").
The manager finds the followinginformation for 125 intent-to-purchase scores for asoon-to-be-released CD:
Group sample size samplemean sample variance
Oncampus 25 67.5 85.2
Bymail 25 67.1 86.7
Byphone 25 64.0 92.6
Byinternet 25 70.2 98.1
In astore 25 75.5 109.4
(send to excel)
The manager's next step is to conduct a one-way,independent-samples ANOVA test to decide if there is a differencein the mean intent-to-purchase score for this CD depending on themethod of collecting the scores.
Answer the following, carrying your intermediate computations toat least three decimal places and rounding your responses to atleast one decimal place.
- What is thevalue of the mean square for error (the “within groups”mean square) that would be best reported in the ANOVA test?
- What is thevalue of the mean square for treatments (the “betweengroups” mean square) that would be best reported in the ANOVAtest?
Explanation / Answer
Source
df
Mean Square
Fisher F-value
Significance (p)
Between Groups:
1,861.30
4
465.325
4.929
0.001
Within Groups:
11,327.64
120
94.397
Total:
13,188.94
124
Source
Sum of Squaresdf
Mean Square
Fisher F-value
Significance (p)
Between Groups:
1,861.30
4
465.325
4.929
0.001
Within Groups:
11,327.64
120
94.397
Total:
13,188.94
124
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