Fish VentilationMost fish use gills for respiration in water and researchers can observe how fast a fish’s gill cover beats to study ventilation, much like we might observe breathing rate for a person. Professor Brad Baldwin is interested in how water chemistry might affect gill beat rates. In one experiment he randomly assigned fish to tanks with different levels of calcium. One tank was low in calcium (0.71 mg/L), the second tank had a medium amount (5.24 mg/L), and the third tank had water with a high calcium level (18.24 mg/L). His research team counted gill rates (beats per minute) for samples of 30 fish in each tank. The results1 are stored in FishGills3. Calcium GillRate Low 55 Low 63 Low 78 Low 85 Low 65 Low 98 Low 68 Low 84 Low 44 Low 87 Low 48 Low 86 Low 93 Low 64 Low 83 Low 79 Low 85 Low 65 Low 88 Low 47 Low 68 Low 86 Low 57 Low 53 Low 58 Low 47 Low 62 Low 64 Low 50 Low 45 Medium 38 Medium 42 Medium 63 Medium 46 Medium 55 Medium 63 Medium 36 Medium 58 Medium 73 Medium 69 Medium 55 Medium 68 Medium 63 Medium 73 Medium 45 Medium 79 Medium 41 Medium 83 Medium 60 Medium 48 Medium 59 Medium 33 Medium 67 Medium 43 Medium 57 Medium 72 Medium 46 Medium 74 Medium 68 Medium 83 High 59 High 45 High 63 High 52 High 59 High 78 High 72 High 53 High 69 High 68 High 57 High 63 High 68 High 83 High 38 High 85 High 68 High 63 High 58 High 48 High 42 High 42 High 80 High 42 High 52 High 37 High 57 High 62 High 40 High 42 (a) Use technology to check that the conditions for an ANOVA model are reasonable for these data. Include a plot that compares the gill rates for the three calcium conditions. (b) If the conditions are met, use technology to find the ANOVA table and complete the test. If the conditions are not reasonable, use a randomization test (scrambling the calcium levels) to complete the test.

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
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Fish Ventilation

Most fish use gills for respiration in water and researchers can observe how fast a fish’s gill cover beats to study ventilation, much like we might observe breathing rate for a person. Professor Brad Baldwin is interested in how water chemistry might affect gill beat rates. In one experiment he randomly assigned fish to tanks with different levels of calcium. One tank was low in calcium (0.71 mg/L), the second tank had a medium amount (5.24 mg/L), and the third tank had water with a high calcium level (18.24 mg/L). His research team counted gill rates (beats per minute) for samples of 30 fish in each tank. The results1 are stored in FishGills3.

Calcium GillRate
Low 55
Low 63
Low 78
Low 85
Low 65
Low 98
Low 68
Low 84
Low 44
Low 87
Low 48
Low 86
Low 93
Low 64
Low 83
Low 79
Low 85
Low 65
Low 88
Low 47
Low 68
Low 86
Low 57
Low 53
Low 58
Low 47
Low 62
Low 64
Low 50
Low 45
Medium 38
Medium 42
Medium 63
Medium 46
Medium 55
Medium 63
Medium 36
Medium 58
Medium 73
Medium 69
Medium 55
Medium 68
Medium 63
Medium 73
Medium 45
Medium 79
Medium 41
Medium 83
Medium 60
Medium 48
Medium 59
Medium 33
Medium 67
Medium 43
Medium 57
Medium 72
Medium 46
Medium 74
Medium 68
Medium 83
High 59
High 45
High 63
High 52
High 59
High 78
High 72
High 53
High 69
High 68
High 57
High 63
High 68
High 83
High 38
High 85
High 68
High 63
High 58
High 48
High 42
High 42
High 80
High 42
High 52
High 37
High 57
High 62
High 40
High 42

(a) Use technology to check that the conditions for an ANOVA model are reasonable for these data. Include a plot that compares the gill rates for the three calcium conditions.

(b) If the conditions are met, use technology to find the ANOVA table and complete the test. If the conditions are not reasonable, use a randomization test (scrambling the calcium levels) to complete the test.

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