Grand mean=14.82 Calculate effect size using the formula d=(M-u)/
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 11PPS
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Question
Grand mean=14.82
Calculate effect size using the formula d=(M-u)/
![Iranian researchers studied factors affecting patients' likelihood of wearing orthodontic appliances, noting that
orthodontics is perhaps the area of health care with the highest need for patient cooperation (Behenam & Pooya,
2007). Among their analyses, they compared students in primary school, junior high school, and high school. The
data that follow have almost exactly the same means as they found in their study, but with far smaller samples.
The score for each student is his or her daily hours of wearing the orthodontic appliance.
Groups
nk
Primary school: 16, 13, 18
Junior high school: 8, 13, 14, 12
High school: 20, 15, 16, 18
Primary school
15.67
6.33
Junior high school
11.75
6.92
High school
17.25
4.92
State research and null hypotheses in words & symbols:
The F-distribution shows values of F you would get if you repeatedly drew 3+ samples from one particular population and
calculated the ratio of between-groups to within-groups variance.
dfpetween =
dfwithin
dftotal =
Determine the critical value and mark it on the
distribution to the right.
Ferit (dfpetween dfwithin) =
5%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F69a1ce84-db88-4326-af40-84d5b4e4eb60%2Fb5f6be09-84ae-4d32-81ea-cc4eda89d16f%2Fba56no_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Iranian researchers studied factors affecting patients' likelihood of wearing orthodontic appliances, noting that
orthodontics is perhaps the area of health care with the highest need for patient cooperation (Behenam & Pooya,
2007). Among their analyses, they compared students in primary school, junior high school, and high school. The
data that follow have almost exactly the same means as they found in their study, but with far smaller samples.
The score for each student is his or her daily hours of wearing the orthodontic appliance.
Groups
nk
Primary school: 16, 13, 18
Junior high school: 8, 13, 14, 12
High school: 20, 15, 16, 18
Primary school
15.67
6.33
Junior high school
11.75
6.92
High school
17.25
4.92
State research and null hypotheses in words & symbols:
The F-distribution shows values of F you would get if you repeatedly drew 3+ samples from one particular population and
calculated the ratio of between-groups to within-groups variance.
dfpetween =
dfwithin
dftotal =
Determine the critical value and mark it on the
distribution to the right.
Ferit (dfpetween dfwithin) =
5%
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