Question
In: Statistics and Probability
Thirty professors took an intensive teacher-training class before the Fall ’14 semester began and they were...
Thirty professors took an intensive teacher-training class before
the Fall ’14 semester began and they were paired with professors
teaching the same courses who did not take the intensive training
class. Course evaluations were compared at the end of the semester,
and the mean advantage for those who took the course compared to
their matched counterparts was 1 point on ratings of the question
“The instructor is an excellent teacher.” The standard deviation of
this difference was 2.5. Do teacher training classes improve
teaching evaluations? Use a 1% significance level. Show your work
for all 4 steps in hypothesis testing. Be sure to include diagrams
and to determine and interpret the p-value for your test-statistic.
State in words the conclusion you reach from the hypothesis test
suggests about the answer to the italicized question.
Solutions
orchestra answered 1 year agoRelated Solutions
Of the ten students who received an "A+" in a class during the fall 2019 semester,...
Of the ten students who received an "A+" in a class during the
fall 2019 semester, three were sophomores, two were juniors, and
one was a senior (the remaining student(s) were in their first
year). the teacher believes four of the ten students are strong
candidates for TA positions. Determine the probability the four
candidates include exactly one student from each year in
college.
Eleven students and 14 professors took part in a study to find mean commuting distances. The...
Eleven students and 14 professors took part in a study to find
mean commuting distances. The mean number of miles traveled by
students was 5.6 and the standard deviation was 2.8. The mean
number of miles traveled by professors was 14.3 and the standard
deviation was 9.1. Perform a test of the null hypothesis that the
population variances are equal.
During the course of a semester, 10 students in Mr. Smith’s class took three exams. Use...
During the course of a semester, 10 students in Mr. Smith’s
class took three exams. Use Microsoft®Excel®
to compute all the descriptive statistics for the following set of
three test scores over the course of a semester. Which test had the
highest average score? Which test had the smallest amount of
variability? How would you interpret the differences between exams,
and note the range, means, and standard deviations over time?
Test 1
Test 2
Test 3
90
94
95
65...
A kindergarten class consists of 14 boys and 11 girls. If the teacher selects children a)...
A kindergarten class consists of 14 boys and 11 girls. If the
teacher selects children
a) If the teacher selects a random sample of n=3 children, and
the first two children are boys and leave the classroom as soon as
selected, what is the probability that the third child selected
will be a girl?
b)In the same situation, what is the probability that the
third child is a boy?
In a statistics class, 8 students took their pulses before and after an exam. The pulse...
In a statistics class, 8 students took their pulses before and
after an exam. The pulse rates (beats per minute) of the students
before and after the exam were obtained separately and are shown in
the table. Treat this as though it were a random sample of
statistics students. Test the hypothesis that the mean of
statistics students' pulse rates is higher after an exam using a
significance level of 0.05. Do the 5-step hypothesis test and
submit an image...
You were the top student in your physiology class last semester. For this reason, your professor...
You were the top student in your physiology class last semester.
For this reason, your professor has asked that you prepare some
lectures for her physiology class this semester. Specifically, she
would like you to discuss the similarities and differences between
the cardiovascular and respiratory systems, in terms of pressure
gradients and fluid flow. A. Explain how you will describe the role
of the following structures: the pump and the tubes. B. Explain how
you will describe the importance of...
1) You were the top student in your physiology class last semester. For this reason, your...
1) You were the top student in your physiology class last
semester. For this reason, your professor has asked that you
prepare some lectures for her physiology class this semester.
Specifically, she would like you to discuss the similarities and
differences between the cardiovascular and respiratory systems, in
terms of pressure gradients and fluid flow.
Explain how will you describe the role of the following
structures: the pump and the tubes.
2) Julia is breathing 14 times per minute, with...
1) You were the top student in your physiology class last semester. For this reason, your...
1) You were the top student in your physiology class last
semester. For this reason, your professor has asked that you
prepare some lectures for her physiology class this semester.
Specifically, she would like you to discuss the similarities and
differences between the cardiovascular and respiratory systems, in
terms of pressure gradients and fluid flow.
Explain how will you describe the role of the following
structures: the pump and the tubes.
2) List, compare, and contrast the locations and stimuli...
Brothers and sisters: Thirty students in a first-grade class were asked how many siblings they have....
Brothers and sisters: Thirty students in a
first-grade class were asked how many siblings they have. Following
are the results.
1
1
2
1
2
3
7
1
1
5
1
1
3
0
1
1
1
2
5
0
0
1
2
2
4
2
2
3
3
4
a.
Construct a frequency histogram.
b.
Construct a relative frequency histogram.
c.
Are the histograms skewed to the left, skewed to the right, or
approximately symmetric?
Eight students were given a quiz before & after they took review classes had the following...
Eight students were given a quiz before & after they took
review classes had the following ratings:
Before
After
5
6
6
6
4
9
4
6
4
5
5
6
8
9
7
10
What is the critical value at the .05 level of
significance?
What is the test statistic?
At an .05 level of significance, can we conclude that the
review classes were helpful?
Using the data above, assume that these were scores of two
groups of 8...
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