You wish to test the following claim (Ha) at a significance level of a = 0.001. For the context of this problem, d = 2-₁ where the first data set represents a pre-test and the second data set represents a post-test. Ho: d=0 Ha: μα < 0 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n = 21 subjects. The average difference (post- pre) is d = -13.4 with a standard deviation of the differences of sd = 24.6. What is the critical value for this test? (Report answer accurate to three decimal places.) critical value= What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = The test statistic is... O in the critical region O not in the critical region This test statistic leads to a decision to... O reject the null accept the null O fail to reject the null As such, the final conclusion is that... There is sufficient evidence to warrant rejection of the claim that the mean difference of post-test from pre-test is less than 0. There is not sufficient evidence to warrant rejection of the claim that the mean difference of post- test from pre-test is less than 0. The sample data support the claim that the mean difference of post-test from pre-test is less than 0. There is not sufficient sample evidence to support the claim that the mean difference of post-test from pre-test is less than 0.
You wish to test the following claim (Ha) at a significance level of a = 0.001. For the context of this problem, d = 2-₁ where the first data set represents a pre-test and the second data set represents a post-test. Ho: d=0 Ha: μα < 0 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n = 21 subjects. The average difference (post- pre) is d = -13.4 with a standard deviation of the differences of sd = 24.6. What is the critical value for this test? (Report answer accurate to three decimal places.) critical value= What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = The test statistic is... O in the critical region O not in the critical region This test statistic leads to a decision to... O reject the null accept the null O fail to reject the null As such, the final conclusion is that... There is sufficient evidence to warrant rejection of the claim that the mean difference of post-test from pre-test is less than 0. There is not sufficient evidence to warrant rejection of the claim that the mean difference of post- test from pre-test is less than 0. The sample data support the claim that the mean difference of post-test from pre-test is less than 0. There is not sufficient sample evidence to support the claim that the mean difference of post-test from pre-test is less than 0.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Question
Transcribed Image Text:You wish to test the following claim (Ha) at a significance level of a = 0.001. For the context of this
problem, d = μ₂-₁ where the first data set represents a pre-test and the second data set represents a
post-test.
Ho : μa = 0
Ha : μα < 0
You believe the population of difference scores is normally distributed, but you do not know the standard
deviation. You obtain pre-test and post-test samples for n = 21 subjects. The average difference (post-
pre) is d = -13.4 with a standard deviation of the differences of sd = 24.6.
What is the critical value for this test? (Report answer accurate to three decimal places.)
critical value =
What is the test statistic for this sample? (Report answer accurate to three decimal places.)
test statistic =
The test statistic is...
O in the critical region
not in the critical region
This test statistic leads to a decision to...
O reject the null
accept the null
fail to reject the null
As such, the final conclusion is that...
There is sufficient evidence to warrant rejection of the claim that the mean difference of post-test
from pre-test is less than 0.
There is not sufficient evidence to warrant rejection of the claim that the mean difference of post-
test from pre-test is less than 0.
The sample data support the claim that the mean difference of post-test from pre-test is less than 0.
There is not sufficient sample evidence to support the claim that the mean difference of post-test
from pre-test is less than 0.
Expert Solution
Step 1
Given that
Sample size = n = 21, df = n - 1 = 20
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