Previous studies consider that vegetarians might not receive enough zinc in their diets. As the zinc requirement is particularly significant during pregnancy, researchers conducted a study to find 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 zinc levels (ug/g) in the hair of three groups of women. (Data from J. C. King. Nutrition 34 (1981): 1049-1055.)
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Pregnant nonvegetarians
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Pregnant vegetarians
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Nonpregnant vegetarians
|
|
185
|
171
|
139
|
|
189
|
174
|
172
|
|
187
|
186
|
198
|
|
181
|
171
|
177
|
|
176
|
150
|
163
|
|
207
|
125
|
|
|
210
|
189
|
|
|
179
|
|
|
174
|
|
|
184
|
|
How many degrees of freedom for Between Groups calculation?
How many degrees of freedom for in Groups calculation?
F = ?
Critical value of F = ? (use alpha = 0.05)
Should you reject the null hypothesis?