Previous studies suggest that vegetarians may not receive enough zinc in their d
ID: 3433623 • Letter: P
Question
Previous studies suggest that vegetarians may not receive enough zinc in their diets. As the zinc requirement is particularly important during pregnancy. researchers conducted a study to determine whether vegetarian pregnant women are at greater risk from low zinc levels than are nonvegetarian pregnant women. 22 women were monitored. The following table presents the zinc levels (ug/g) in the hair of three groups of women. (Data from J. C. King. Nutrition 34(1981): 1049-1055.) 125 How many degrees of freedom for the Within Groups calculation? How many degrees of freedom for the Between Groups calculation? Should you reject the null hypothesis?Explanation / Answer
One factor ANOVA
Mean
n
Std. Dev
190.7
7
12.89
preg nonveg
170.3
10
19.30
preg veg
169.8
5
21.49
nonpreg veg
176.7
22
19.78
Total
ANOVA table
Source
SS
df
MS
F
p-value
Treatment
2,022.44
2
1,011.222
3.10
.0683
Error
6,196.33
19
326.123
Total
8,218.77
21
Degrees of freedom between groups =2
Degrees of freedom within groups =19
F=3.10
Critical F= 3.52
Do not reject the null hypothesis
One factor ANOVA
Mean
n
Std. Dev
190.7
7
12.89
preg nonveg
170.3
10
19.30
preg veg
169.8
5
21.49
nonpreg veg
176.7
22
19.78
Total
ANOVA table
Source
SS
df
MS
F
p-value
Treatment
2,022.44
2
1,011.222
3.10
.0683
Error
6,196.33
19
326.123
Total
8,218.77
21
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