A feeding test is conducted on a herd of 25 milking cows tocompare diets, one of
ID: 2953315 • Letter: A
Question
A feeding test is conducted on a herd of 25 milking cows tocompare diets, one of dewatered alfalfa and the other offield-wilted alfalfa. Dewatered alfalfa has an economic advantagein that it’s mechanical processing produces a liquidprotein-rich by product that can be used to supplement the feed ofother animals. A simple of 12 cows randomly selected from the herdare fed dewatered alfalfa; the remaining 13 cows are fedfield-wilted alfalfa. From observations made over a three-weekperiod, the average daily milk production in dollars recorded foreach cow is:
Field-wilted alfalfa
44
44
56
46
47
38
58
53
49
35
46
30
41
Dewatered alfalfa
35
47
55
29
40
39
32
41
42
57
51
39
-
Do the data strongly indicate that the milk yield is less withdewatered alfalfa than with field-wilted alfalfa? Test at =0.05
Field-wilted alfalfa
44
44
56
46
47
38
58
53
49
35
46
30
41
Dewatered alfalfa
35
47
55
29
40
39
32
41
42
57
51
39
-
Explanation / Answer
field-wilted alfalfa: n1=13, xbar1=45.15, s1=8 dewatered alfalfa: n2=12, xbar2=42.25, s2=8.7 =0.05, t(0.05,df=n1+n2-2=23)=1.71 (check student t table) The test hypothesis is Ho:1>=2 Ha:1Related Questions
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