Answered: what statistical decision you should…

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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Let's stick with our friend Dr. Fraudulus with the red palm oil and the girls & boys with ADHD...

Source	SS	df	MS	F
Between treatments	800	k - 1
Factor A (dosage)	360	Levels of A - 1	180	MS_A / MS_within
Factor B (gender)	250	Levels of B - 1	250	7.45
A x B	190	df_A x df_B	95	MS_AxB / MS_within
Within treatments (error)	ΣSS_{inside each} _treatment	Σdf_{inside each treatment}	33.54
Total	5630	N - 1

Let's say you found an F-ratio of 7.45 for Factor B. Let's also say the critical value you are using for this problem is F(1,125) = 3.92.

From the options below, select:

what statistical decision you should make
the most appropriate option for describing these findings related to Factor B, in layperson's terms, based on what we know from this particular problem.

		Fail to reject the null hypothesis
		Reject the null hypothesis
		Boys have more ADHD symptoms than girls
		There is an effect of gender on the level of ADHD symptoms
		Gender is not related to ADHD symptoms

part f

Expert Solution

Step 1

The critical value will be F(1,125) = 3.92.

F-ratio is given as 7.45

Null hypothesis is rejected by F-ratio is greater than or equal to critical value.

Here, $F - r a t i o (7.45) > c r i t i c a l v a l u e (3.92)$

Thus,

Reject the null hypothesis

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