Experiment

Our experiment was designed to show how the changes in water temperature affect the heart beats per minute of a daphnia crustacean. We concluded that as the water temperature increased, the heart beats per minute went up. As the temperature decreased, so did the number of heart beats per minute.

We conducted out percentage of error as follows: (bpm means beats per minute)

Warm Water:
Trial 1: 184.5 bpm
Trial 2: 202.5 bpm
Trial 3: 205.5 bpm

Mean: (184.5+202.5+205.5)/3 = 197.5 bpm

Trial 1 Deviation: abs(184.5-197.5) = 13
Trail 2 Deviation: abs(202.5-197.5) = 5
Trial 3 Deviation: abs(205.5-197.5) = 8

Standard Deviation: (13+5+8)/3 =8.7

Percent Error: 8.7/197.5=.044

.044*100 = 4.4% Error

Control Water:
Trial 1: 183 bpm
Trial 2: 195 bpm
Trial 3: 184.2 bpm

Mean: (183+195+184.2)/3 = 187.4 bpm

Trial 1 Deviation: abs(183-187.4) = 4.4
Trial 2 Deviation: abs (195-187.4) = 7.6
Trial 3 Deviation: abs (184.2-187.4) =3.2

Standard Deviation: (4.4+7.6+3.2)/3 = 5.07

Percent Error: 5.01/187.4 =.0271

.0271*100 = 2.71% Error

Cold Water:
Trial 1: 156 bpm
Trial 2: 132 bpm
Trial 3: 139.5 bpm

Mean: (156+132+139.5)/3 = 142.5

Trial 1 Deviation: abs(156-142.5) = 13.5
Trial 2 Deviation: abs(132-142.5) = 10.5
Trial 3 Deviation: abs(139.5-142.5) = 3

Standard Deviation: (13.5+10.5+3).3 = 9

Percent Error: 9/142.5 = .063

.063*100 = 6.32% Error

Another part of our experiment which is important to understand is that Daphnia 1, 2, and 3 are not the same Daphnia. For example, Daphnia 1 for control water was not the same Daphnia as Daphnia 1 for warm water or Daphnia 1 for cold water. They were all different Daphnia. Sorry, that is hard to understand when looking at our results.

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