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