Question

Use SPSS .....

A pool of participants was randomly divided into four treatment groups. The groups were administered daily doses of vitamin C over a 12-month period. The data in the table represents severity of cold and flu viruses reported as a function of virus concentration in the blood. In other words, the higher the concentration of virus, the more severe the symptoms.Assume the sample sizes are large and that the instrumentation to measure virus activity, used an appropriate measurement. Determine if differing doses of vitamin C affects the severity of viral infections. If there are any differences, where are they?   Type your interpretation in a text box on the results page. 25 pts.

​0mg​​250mg​​500mg​​1000mg​

6​​3​​3​​4​​

5​​4​​3​​1​​

3​​5​​4​​0​​

2​​4​​2​​3​

6​​3​​2​​2

Answer 1

ANSWER :

The given information is

SPSS used to compare the 4 groups.

Ho: µ1= µ2= µ3= µ4

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

ANOVA
Severity
	Sum of Squares	df	Mean Square	F	Sig.
Between Groups	16.950	3	5.650	3.139	0.055
Within Groups	28.800	16	1.800
Total	45.750	19

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.