Question 1) Previous studies suggest that vegetarians may not receive enough zin
ID: 3340671 • Letter: Q
Question
Question 1)
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.)
Pregnant nonvegetarians
Pregnant vegetarians
Nonpregnant vegetarians
185
171
139
187
186
198
181
171
177
176
150
163
207
125
153
210
189
199
179
174
184
160
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?
Question 2)
The Cougar Swim Club acquired some Speedo Fastskin bodysuits and decided to test them out. A number of the club's fastest swimmers performed a 50m freestyle swim in a regular spandex bodysuit and in a Speedo Fastskin suit. The table below summarizes their times in seconds (s).
Swimmer
spandex
Speedo Fastskin
1
31.1
29.1
2
28.9
30.4
3
31.4
32.0
4
34.9
31.7
5
27.7
28.2
6
36.7
32.9
7
33.3
28.6
8
30.8
26.2
Perform a t-test for dependent means to determine if there is a difference between the regular spandex suit and the Fastskin bodysuit in terms of performance.
t =
df =
Critical value of t (use alpha = 0.05) =
Would you reject the null hypothesis?
Pregnant nonvegetarians
Pregnant vegetarians
Nonpregnant vegetarians
185
171
139
187
186
198
181
171
177
176
150
163
207
125
153
210
189
199
179
174
184
160
Explanation / Answer
Ans:
1)
As,p-value<0.05,We reject null hypothesis.
2)
t statistic = (-1.9625 - 0) / (2.5065 / sqrt 8) = 2.215
df = 7
Critical value of t = (use alpha = 0.05) = 2.365
As t-statistic < critical t ,Wet null fail to reject null hypothesis.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.