Previous studies suggest that vegetarians may not receive en

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? Yes or No?

Solution

How many degrees of freedom for the Between Groups calculation? __3-1=2___________

How many degrees of freedom for the Within Groups calculation?___23-3=20_________

F = __8.098/440.786 =0.01837173________________

Critical value of F = ____3.49_______ (use alpha = 0.05)

Should you reject the null hypothesis? Yes or No?

No