A researcher is investigating whether a reading intervention program improves reading comprehension for second graders. He collects a random sample of second graders and randomly assigns each second grader to participate in the reading intervention program or not participate in the program. The researcher knows that the standard deviation of the reading comprehension scores among all second graders is σ = 13.35. Group 1 consists of n₁ = 38 second graders who did not participate in the program. Their mean reading comprehension score is M₁ = 22.8. Group 2 consists of n₂ = 42 second graders who did participate in the program. Their mean reading comprehension score is M₂ = 46.1. Of the plots that follow, which best represents a plot of these results? Plot A Plot B
A researcher is investigating whether a reading intervention program improves reading comprehension for second graders. He collects a random sample of second graders and randomly assigns each second grader to participate in the reading intervention program or not participate in the program. The researcher knows that the standard deviation of the reading comprehension scores among all second graders is σ = 13.35. Group 1 consists of n₁ = 38 second graders who did not participate in the program. Their mean reading comprehension score is M₁ = 22.8. Group 2 consists of n₂ = 42 second graders who did participate in the program. Their mean reading comprehension score is M₂ = 46.1. Of the plots that follow, which best represents a plot of these results? Plot A Plot B
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.7: Operations On Functions
Problem 54E
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A researcher is investigating whether a reading intervention program improves reading comprehension for second graders. He collects a random sample of second graders and randomly assigns each second grader to participate in the reading intervention program or not participate in the program. The researcher knows that the standard deviation of the reading comprehension scores among all second graders is σ = 13.35.
Group 1 consists of n₁ = 38 second graders who did not participate in the program. Their mean reading comprehension score is M₁ = 22.8. Group 2 consists of n₂ = 42 second graders who did participate in the program. Their mean reading comprehension score is M₂ = 46.1.
Of the plots that follow, which best represents a plot of these results?
Plot A
Plot B
Plot C
Plot D
The brackets or error bars shown at the top of each bar extend __a____ above and below each of the group means. For group 1, the error bar extends __b____ units above and below the mean for group 1.
Answer choices for a:
one standard deviation
One standard error
Answer choices for b:
2.06
15.7
2.17
13.35
Transcribed Image Text:Plot A
Plot B
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group 1
group 2
group 1
group 2
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Plot C
Plot D
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group 1
group 2
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Mean Score
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Mean Score
Mean Score
10
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