Question
In: Statistics and Probability
Volunteers are given a cortisol blood test before and after learning a relaxation technique. Cortisol concentration...
Volunteers are given a cortisol blood test before and after learning a relaxation technique. Cortisol concentration is known to be positively associated with stress. Data below are cortisol concentrations before and after the relaxation training. Test to see if cortisol concentration changed as a result of the training. Use 4 steps and a = .05.
| before training | after training |
| 15 | 9 |
| 13 | 10 |
| 10 | 8 |
| 13 | 7 |
| 14 | 11 |
| 9 | 10 |
Solutions
orchestra answered 2 years agoRelated Solutions
Volunteers are given a cortisol blood test before and after learning a relaxation technique. Cortisol concentration...
Volunteers are given a cortisol blood test before and after
learning a relaxation technique. Cortisol concentration is known to
be positively associated with stress. Data below are cortisol
concentrations before and after the relaxation training. Test to
see if cortisol concentration changed as a result of the training.
Use 4 steps and a = .05.
before training
after training
15
9
13
10
10
8
13
7
14
11
9
10
In a experiment on relaxation techniques, subject's brain signals were measured before and after the relaxation...
In a experiment on relaxation techniques, subject's brain
signals were measured before and after the relaxation exercises
with the following results:
Person
1
2
3
4
5
Before
42.2
42.4
38.8
41.6
38.6
After
44.2
40.9
40.8
35.3
33.5
Is there sufficient evidence to suggest that the relaxation
exercise slowed the brain waves? Assume the population is normally
distributed. Select the test statistic, p-value, Decision to Reject
(RH0) or Failure to Reject (FRH0)].
Explain how to do using RStudio, please
In a experiment on relaxation techniques, subject's brain signals were measured before and after the relaxation...
In a experiment on relaxation techniques, subject's brain
signals were measured before and after the relaxation exercises
with the following results:
Person
1
2
3
4
5
Before
38.6
41.2
37.9
38.6
42.6
After
37.0
37.0
34.3
36.9
43.6
Is there sufficient evidence to suggest that the relaxation
exercise slowed the brain waves? Assume the population is normally
distributed.
Select the test statistic, p-value, Decision to Reject
(RH0) or Failure to Reject (FRH0)].
a) [t = 2.214, p-value = 0.023,...
A test of abstract reasoning is given to a sample of students before and after they...
A test of abstract reasoning is given to a sample of students
before and after they completed a formal logic course. Assume that
two dependent samples have been randomly selected from normally
distributed populations. The results are given below. At the 0.05
significance level, use critical value method to test the claim
that the mean score is not affected by the course. Does the course
improve the students’ skill on abstract reasoning?
Before 74 83 75 88 84 63 93...
A test of abstract reasoning is given to a random sample of students before and after...
A test of abstract reasoning is given to a random sample of
students before and after they completed a formal logic course. The
results are given below. Construct a 95% confidence interval for
the mean difference in tests scores. Research has shown that the
distribution of such differences is approximately normal. Interpret
your result.
Before
74
83
75
82
80
63
93
84
91
77
After
73
77
70
77
74
67
95
83
84
75
Lactate concentration in the blood rises rapidly during hard running. After running, the blood concentration drops...
Lactate concentration in the blood rises rapidly during hard
running. After running, the blood concentration drops slowly.
Describe why the lactate concentration increases and why it
decreases.
The systolic blood pressure of 16 students was measured before a test. The blood pressure from...
The systolic blood pressure of 16 students was measured before a
test. The blood pressure from this sample averaged 165, with a
standard deviation of 40.
a) Compute the approximate 95% confidence interval for mean
systolic blood pressure, and make a sketch illustrating these
confidence intervals
b) If a mean blood pressure above 130 is considered “stressed”,
what do your calculations show regarding the probability that the
observed mean is above the “stressed” level.
Five sophomores were given an English achievement test before and after receiving instruction in basic grammar....
Five sophomores were given an English achievement test before
and after receiving instruction in basic grammar. The mean
difference score is -0.40, and the estimated variance for the
difference scores is 8.3. Using the .05 significance level (and
five steps of hypothesis testing) is it reasonable to conclude that
future students would show higher scores after instruction?
Step I:
-Population 1: -Population 2: -
Research hypothesis:
Null hypothesis:
Step II: Give the characteristics of the comparison distribution
-The shape is:...
A test of abstract reasoning is given to a random sample of students before and after they completed a formal logic course
A test of abstract reasoning is given to a random sample of students before and after they completed a formal logic course. The results are given below. At the 0.05 significance level, test the claim that the mean score is not affected by the course. Before: 74,83,75,88,84,63,93,84,91,77 After: 73,77,70,77,74,67,95,83,84,75 a. Write the null and the alternative hypothesis? b. are the means independent or dependent? explain. c. is it one or two tailed test? d. find the p value? E. write...
Five university students were given an English achievement test before and after receiving instruction in basic...
Five university students were given an English achievement test
before and after receiving instruction in basic grammar. Their
scores are shown below: Student Before After A 20 18 B 18 22 C 17
15 D 16 17 E 12 9
Should we conclude that future students would show higher scores
after instruction? Use the .05 significance level. Use hypothesis
testing.
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