Question
In: Math
A psychologist is examining the educational advantages of a preschool program and suspects that there will...
A psychologist is examining the educational advantages of a preschool program and suspects that there will be significant (α = .01) differences in achievement among 4th graders based on whether or not they attended preschool. Twenty-three randomly selected 4th grade children are used in the study. Twelve attended a preschool program and eleven did not (see the data below).
Group 1 - Preschool: 8, 6, 8, 9, 7, 9, 6, 9, 8, 9, 7, 8
Group 2 - No Preschool: 6, 5, 7, 6, 8, 5, 7, 5, 6, 7, 5
What is the alternative hypothesis for this independent samples t-test?
Group of answer choices µ1 - µ2 ≥ 0 µ1 - µ2 = 0 µ1 - µ2 ≠ 0 µ1 - µ2 ≤ 0 µ1 - µ2 µ1 - µ2 > 0
Solutions
milcah answered 14 hours agoRelated Solutions
An educational psychologist is interested in knowing whether the experience of attending preschool is related to...
An educational psychologist is interested in knowing whether the
experience of attending preschool is related to subsequent
sociability. She identifies two groups of first graders: those who
had attended preschool and those who had not. Then each child is
assigned a sociability score on the basis of observations made in
the classroom and on the playground. Perform the 4 steps of
hypothesis testing if using alpha is set at .05 for a two-tailed
test.
The following sociability results are
obtained:...
1. An educational psychologist is interested in knowing whether the experience of attending preschool is related...
1. An educational psychologist is interested in knowing
whether the experience of attending preschool is related to
subsequent sociability. She identifies two groups of first graders:
those who had attended preschool and those who had not. Then each
child is assigned a sociability score on the basis of observations
made in the classroom and on the playground. Perform the 4 steps of
hypothesis testing if using alpha is set at .05 for a two-tailed
test.
The following sociability results are...
An educational psychologist is examining response times to an on-screen stimulus. The researcher believes there might...
An educational psychologist is examining response times to an
on-screen stimulus. The researcher believes there might be a weak
effect from age, but expects a more pronounced effect for different
color contrasts. She decides to examine a black on white (B/W)
combination compared to 2 alternatives: red on white (R/W) and
yellow on blue (Y/B). Here is the data for response times (in
milliseconds):
Color Scheme
B/W
R/W
Y/B
Age
16–17
10
26
16
22
11
36
31
22
20...
An educational psychologist wants to know if a popular new hypnosis technique impacts depression. The psychologist...
An educational psychologist wants to know if a popular new
hypnosis technique impacts depression. The psychologist collects a
sample of 15 students and gives them the hypnosis once a week for
two months. Afterwards the students fill out a depression inventory
in which their mean score was 50.55. Normal individuals in the
population have a depression inventory mean of 51 with a standard
deviation of 3.1. What can be concluded with α = 0.01?
a) What is the appropriate test...
An educational psychologist has developed a meditation technique to reduce anxiety. The psychologist selected a sample...
An educational psychologist has developed a meditation technique
to reduce anxiety. The psychologist selected a sample of high
anxiety students that are asked to do the meditation at two therapy
sessions a week apart. The participants' anxiety is measured the
week before the first session and at each subsequent session. Below
are the anxiety scores for the participants. What can the
psychologist conclude with an α of 0.01?
before
session 1
session 2
9
6
8
5
8
6
9...
An educational psychologist has developed a meditation technique to reduce anxiety. The psychologist selected a sample...
An educational psychologist has developed a meditation technique
to reduce anxiety. The psychologist selected a sample of high
anxiety students that are asked to do the meditation at two therapy
sessions a week apart. The participants' anxiety is measured the
week before the first session and at each subsequent session. Below
are the anxiety scores for the participants. What can the
psychologist conclude with α = 0.05?
before
session 1
session 2
9
6
8
2
8
6
9
6...
An educational psychologist has developed a mediation technique to reduce anxiety. The psychologist selected a sample...
An educational psychologist has developed a mediation technique
to reduce anxiety. The psychologist selected a sample of high
anxiety students that are asked to do the mediation at two therapy
sessions a week apart. The participants' anxiety is measured the
week before the first session and at each subsequent session. Below
are the anxiety scores for the participants. What can the
psychologist conclude with α= 0.05?
before
session 1
session 2
9
6
8
5
8
6
9
6
8...
An educational psychologist has developed a mediation technique to reduce anxiety. The psychologist selected a sample...
An educational psychologist has developed a mediation technique
to reduce anxiety. The psychologist selected a sample of high
anxiety students that are asked to do the mediation at two therapy
sessions a week apart. The participants' anxiety is measured the
week before the first session and at each subsequent session. Below
are the anxiety scores for the participants. What can the
psychologist conclude with α= 0.05?
before
session 1
session 2
9
6
8
5
8
6
9
6
8...
An educational psychologist has developed a mediation technique to reduce anxiety. The psychologist selected a sample...
An educational psychologist has developed a mediation technique
to reduce anxiety. The psychologist selected a sample of high
anxiety students that are asked to do the mediation at two therapy
sessions a week apart. The participants' anxiety is measured the
week before the first session and at each subsequent session. Below
are the anxiety scores for the participants. What can the
psychologist conclude with α = 0.01?
before
session 1
session 2
9
6
8
5
8
6
9
6...
A historian examining British colonial records for the Gold Coast in Africa suspects that the death...
A historian examining British colonial records for the Gold
Coast in Africa suspects that the death rate was higher among
African miners than among European miners. In the year 1936, there
were 223 deaths among 33,809 African miners and 7 deaths among 1541
European miners on the Gold Coast. Calculate an appropriate 99%
confidence interval for the difference between the proportion of
African miners who died and the proportion of European miners who
died. What is the lower bound of...
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