Previous studies suggest that vegetarians may not receive enough zinc in their d
ID: 3369893 • 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.
23 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.)
Pregnant nonvegetarians
Pregnant vegetarians
Nonpregnant vegetarians
185
171
210
189
174
139
187
202
172
181
171
198
150
207
177
176
125
189
179
163
174
184
186
How many degrees of freedom for the Between Groups calculation?
How many degrees of freedom for the Within Groups calculation?
F =
Critical value of F = (use alpha = 0.05)
Should you reject the null hypothesis?
Pregnant nonvegetarians
Pregnant vegetarians
Nonpregnant vegetarians
185
171
210
189
174
139
187
202
172
181
171
198
150
207
177
176
125
189
179
163
174
184
186
Explanation / Answer
The statistical software output for this problem is:
Analysis of Variance results:
Data stored in separate columns.
Column statistics
ANOVA table
Hence,
Between group degrees of freedom = 2
Within group degrees of freedom = 20
F = 0.018
Critical F value = 3.49
Do not reject Ho
Column n Mean Std. Dev. Std. Error Pregnant nonvegetarians 6 178 14.477569 5.9104427 Pregnant vegetarians 12 177.08333 20.8739 6.0257759 Nonpregnant vegetarians 5 179.2 27.270864 12.195901Related Questions
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