A veterinarian wishes to compare the number of times race horses are reported to be lame during a 12-month period, compared with similar horses that are not raced. The veterinarian is particularly interested whether the exercise schedule used in racing may contribute to lameness rather than the total amount of exercise. The veterinarian chooses 9 race horses and then selects a matching horse that is instead used for jumping, matching horses based on age, breed, and exercising a similar number of hours each week. The table below contains the observed number of times a horse was reported as lame. Group Race 1 7 Jump 2 O(-1.329, 2.663) O(-3.405, 4.738) O(-2.459, 3.792) 2 O (-1.590, 2.923) 8 1 3 2 3 4 O 2 5 3 4 Horse 6 1 1 7 4 3 8 2 7 A 90% confidence interval for the MEAN DIFFERENCE in the number of times a horse is lame is given by: (hint: remember this is a matched pairs data set) 9 6 4

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A veterinarian wishes to compare the number of times race horses are reported
to be lame during a 12-month period, compared with similar horses that are not
raced. The veterinarian is particularly interested whether the exercise schedule
used in racing may contribute to lameness rather than the total amount of
exercise. The veterinarian chooses 9 race horses and then selects a matching
horse that is instead used for jumping, matching horses based on age, breed,
and exercising a similar number of hours each week. The table below contains
the observed number of times a horse was reported as lame.
Group 1
Race
Jump
7
2
O (-1.329, 2.663)
O (-3.405, 4.738)
O (-2.459, 3.792)
2
O (-1.590, 2.923)
8
1
3
2
3
4
0
2
5
3
4
Horse
6
1
1
7
st
4
3
8
2
7
A 90% confidence interval for the MEAN DIFFERENCE in the number of times a
horse is lame is given by:
(hint: remember this is a matched pairs data set)
9
6
4
Transcribed Image Text:A veterinarian wishes to compare the number of times race horses are reported to be lame during a 12-month period, compared with similar horses that are not raced. The veterinarian is particularly interested whether the exercise schedule used in racing may contribute to lameness rather than the total amount of exercise. The veterinarian chooses 9 race horses and then selects a matching horse that is instead used for jumping, matching horses based on age, breed, and exercising a similar number of hours each week. The table below contains the observed number of times a horse was reported as lame. Group 1 Race Jump 7 2 O (-1.329, 2.663) O (-3.405, 4.738) O (-2.459, 3.792) 2 O (-1.590, 2.923) 8 1 3 2 3 4 0 2 5 3 4 Horse 6 1 1 7 st 4 3 8 2 7 A 90% confidence interval for the MEAN DIFFERENCE in the number of times a horse is lame is given by: (hint: remember this is a matched pairs data set) 9 6 4
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