6. Dehorning of Dairy Calves For safety reasons, calf dehorning has become a routine practice at dairy farms. A report by Europe's Standing Committee on the Food Chain and Animal Health (SANKO) stated...

show workkk

Extracted text: 6. Dehorning of Dairy Calves For safety reasons, calf dehorning has become a routine practice at dairy farms. A report by Europe's Standing Committee on the Food Chain and Animal Health (SANKO) stated that 80% of the European dairy farms carry out calf dehorning. A later study, published in the Journal of Dairy Science (Vol. 94. 2011), found that in a sample of 639 Italian dairy farms, there were 515 dehorned calves. Does the Journal of Dairy Science study support or refute the figure reported by SANKO? Answer this question by carrying out a hypothesis test using a = 0.10. Hint: You want to test the claim that the true proportion DIFFERS from 0.80. (Complete Parts (a), (b), and (c).) (a) The value of the test statistic (rounded to two decimal places) is (i) 0.38 (ii) 1.42 (iii) -2.13 (iv) -0.27 (b) The p-value (rounded to three decimal places) is (i) 0.255 (ii) 0.084 (iii) 0.003 (iv) 0.707 (c) Based on your answer to Part (b), (i) Support; There is insufficient evidence to conclude that the percentage of European dairy farms that carry out calf dehorning differs from 80%. (ii) Refute; There is insufficient evidence to conclude that the percentage of European dairy farms that carry out calf dehorning differs from 80%. (iii) Refute; There is sufficient evidence to conclude that the percentage of European dairy farms that carry out calf dehorning differs from 80%. (iv) Support; There is sufficient evidence to conclude that the percentage of European dairy farms that carry out calf dehorning differs from 80%.