Use SPSS ..... A pool of participants was randomly divided into four treatment groups. The groups were administered...

4.1 Ratings (552 Votes)

ANSWER :

The given information is

SPSS used to compare the 4 groups.

Ho: Âµ1= Âµ2= Âµ3= Âµ4

H1: At least one of the mean is different from the others

SPSS command

ONEWAY Severity BY Group
/STATISTICS DESCRIPTIVES
/MISSING ANALYSIS
/POSTHOC=TUKEY ALPHA(0.05).

SPSS output:

Descriptives
Severity
	N	Mean	Std. Deviation	Std. Error	95% Confidence Interval for Mean	Minimum	Maximum
Lower Bound	Upper Bound
0mg	5	4.4000	1.81659	0.81240	2.1444	6.6556	2.00	6.00
250mg	5	3.8000	0.83666	0.37417	2.7611	4.8389	3.00	5.00
500mg	5	2.8000	0.83666	0.37417	1.7611	3.8389	2.00	4.00
1000mg	5	2.0000	1.58114	0.70711	0.0368	3.9632	0.00	4.00
Total	20	3.2500	1.55174	0.34698	2.5238	3.9762	0.00	6.00

Calculated F=3.139, P=0.055 which is > 0.05 level of significance.

The null hypothesis is not rejected.

The data indicate there is no significant difference among the four group means.

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