20. In statistical notion, what is your null hypothesis?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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For #20 - 29: A researcher would like to evaluate the effectiveness of a pain-relief patch designed for back pain.
Prior to testing the patch, each of the patients (n = 7) rated their current level of back pain on a scale from 1 to 10.
After wearing the patch for 90 minutes, a second pain rating is recorded. The data in this repeated-measures design
are as follows:
Pain
Pain
D scores
D2
SS
variance of D=s²
df
Before
After
7
2
.2
4
Mp
SMD
п
9
4
n
5
2
t = MD / SMR.
4
2
1
20. In statistical notion, what is your null hypothesis?
Transcribed Image Text:For #20 - 29: A researcher would like to evaluate the effectiveness of a pain-relief patch designed for back pain. Prior to testing the patch, each of the patients (n = 7) rated their current level of back pain on a scale from 1 to 10. After wearing the patch for 90 minutes, a second pain rating is recorded. The data in this repeated-measures design are as follows: Pain Pain D scores D2 SS variance of D=s² df Before After 7 2 .2 4 Mp SMD п 9 4 n 5 2 t = MD / SMR. 4 2 1 20. In statistical notion, what is your null hypothesis?
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