Investigation in to the effect of caffeine concentrations on daphnia heart rate. Concentration of the solution Test 1Test 2MeanResult of t-test Measured in Beats Per Minute 0.63243923587.63 0.53083243167.63 0.33002442727.42 0.21602081846.79 011641601621.59 0.0 (water)144104124This is what they're compared to. I will use the student t-test to compare the means of the mean of two different dilutions. It is used to compare two normally distributed sets of data T-test allows us to assign a probability level to describe the likelihood that the …showed first 75 words of 1203 total…

…showed last 75 words of 1203 total…the null hypothesis, is 0.000 This is not significant Pond Water compared with 0.2% caffeine Group A: Number of items= 41 72.0 88.0 96.0 96.0 96.0 100. 104. 104. 124. 128. 128. 132. 132. 136. 136. 144. 144. 152. 156. 156. 160. 160. 164. 164. 164. 176. 180. 184. 188. 188. 188. 192. 200. 204. 204. 228. 240. 268. 276. 300. 340. Mean = 166. 95% confidence interval for Mean: 148.0 through 183.4 Standard Deviation = 58.9 Hi = 340. Low = 72.0 Median = 160. Average Absolute Deviation from Median = 43.5 Group B: Number of items= 40 68.0 82.0 88.0 96.0 108. 116. 126. 140. 160. 160. 164. 164. 166. 176. 176. 180. 180. 180. 184. 188. 192. 196. 204. 208. 212. 216. 216. 216. 220. 224. 228. 232. 236. 240. 244. 244. 264. 276. 280. 284. Mean = 188. 95% confidence interval for Mean: 170.4 through 206.3 Standard Deviation = 54.9 Hi = 284. Low = 68.0 Median = 190. Average Absolute Deviation from Median = 43.2 t= -4.57 Standard deviation= 61.9 Degrees of freedom = 79 The probability of this result, assuming the null hypothesis, is 0.000 This is significant