Question
In: Statistics and Probability
A study was designed to investigate the effects of two variables, (1) a student's level of...
A study was designed to investigate the effects of two variables, (1) a student's level of mathematical anxiety and (2) teaching method, on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 380 with a standard deviation of 50 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 280 and 480?
a) at least 75%
b) 88.9%
c) approximately 95%
d) approximately 68%
Solutions
orchestra answered 2 years agoRelated Solutions
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Consider the following studies:
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Study 2: A study was conducted to investigate the efficacy of a new
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currently used...
A study is designed to investigate whether there is a difference in response to various treatments...
A study is designed to investigate whether there is a difference
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treatment? Conduct a ChiSquare test at a 5% level of significance.
1.df= (2 points) 2.Critical value: (2 points) 3.Computed statistic:
(2 points) 4.Based on comparing the computed statistics to the
critical value which of the following is (are) true? (4 points) a....
A study is designed to investigate whether there is a difference in response to various treatments...
A study is designed to investigate whether there is a difference
in response to various treatments in patients with Rheumatoid
arthritis. The outcome is the patient’s self-reported effect of
treatment. The data are shown below. Is there a significant
difference in effect of treatment? Run the test at a 5% level of
significance.
Symptoms
Worsened
No Effect
Symptoms Improved
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Treatment 1
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A pilot study is run to investigate the effect of a lifestyle intervention designed to increase...
A pilot study is run to investigate the effect of a lifestyle
intervention designed to increase medication adherence in patients
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Ten patients with HIV agree to participate and their medication
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Compute the standard deviation of the difference in adherence
before versus after intervention.
Participant ID
Before Intervention
After Intervention
1
75%...
A pilot study is run to investigate the effect of a lifestyle intervention designed to increase...
A pilot study is run to investigate the effect of a lifestyle
intervention designed to increase medication adherence in patients
with HIV. Medication adherence is measured as the percentage of
prescribed pills that are taken over a one-week observation period.
Ten patients with HIV agree to participate and their medication
adherence before and after the intervention are shown below.
Compute the standard deviation of the difference in adherence
before versus after intervention. Please show your work and
explain.Thank you!
Participant...
Question 1 A researcher at a large university wanted to investigate if a student's seat preference...
Question 1 A researcher at a large university wanted to
investigate if a student's seat preference was related in any way
to the gender of the student. The researcher divided the lecture
room into three sections (1-front, middle of the room, 2-front,
sides of the classroom, and 3-back of the classroom, both middle
and sides) and noted where his students sat on a particular day of
the class. The researcher's summary table is provided below.
Area (1)
Area (2)
Area...
Use the following to answer questions. Two separate tests are designed to measure a student's ability...
Use the following to answer questions.
Two separate tests are designed to measure a student's ability to
solve problems. Several students are randomly selected to take both
tests and the results are given below.
Test A 64 48 51 59 60 43 41 42 35 50 45
Test B 91 68 80 92 91 67 65 67 56 78 71
1. What is the
value of the linear coefficient r?
** i got .974
2. Assuming a 0.05
level of...
A study was conducted of the effects of a special class designed to aid students with...
A study was conducted of the effects of a special class designed
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The following data come from a study designed to investigate drinking problems among college students. In...
The following data come from a study designed to investigate
drinking problems among college students. In 1983, a group of
students were asked whether they had ever driven an automobile
while drinking. In 1987, after the legal drinking age was raised, a
different group of college students were asked the same
question.
Drove While
Drinking
Year
Total
1983
1987
Yes
No
1250
991
1387
1666
2241
3053
Total
2637
2657
5294
Use the chi-square test to evaluate the null...
The following data come from a study designed to investigate drinking problems among college students. In...
The following data come from a study designed to investigate
drinking problems among college students. In 1983, a group of
students were asked whether they had ever driven an automobile
while drinking. In 1987, after the legal drinking age was raised, a
different group of college students were asked the same question.
SHOW EXCEL CODES
Drove While Drinking Year
1983 1987 Total
Yes 1250 991 2241
No 1387 1666 3053
Total 2637 2657 5294
A. Use the chi-square test to...
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