Investigation in to the effect of caffeine concentrations on daphnia heart rate.

Investigation in to the publication of caffein concentrations on water flea rawness score. Concentration of the solution Test 1Test 2MeanResult of t-test Measured in beat Per Minute 0.63243923587.63 0.53083243167.63 0.33002442727.42 0.21602081846.79 011641601621.59 0.0 ( irrigate)144104124This is what theyre matchd to. I will employ the learner t-test to compare the means of the mean of 2 unlike dilutions. It is used to compare two normally distributed sets of data T-test allows us to delimit a probability level to describe the likelihood that the worthless possible action is true. This photo labels where the parts you should look out for in the daphnia Results of experiment Null hypothesis ·There will be no significant effect on the heart rate of the daphnia as the caffeine concentration increases. ·I confine decided to use the student t-test as it allows the comparison of two different sets of data. t-test x1 - x2 t = -------------------- ---------------- S12 + S22 n1 n2 Where S1 = first ensample S2 = plunk for sample x = mean of sample S2 = variance of sample (S on its own is the tired deviation of the sample. Variance = square of amount deviation) n = size of sample. x Formula of x = ----------- n ( x )2 x2 - -------- Formula of S2 = -------------------------- n - 1 Pond weewee compared with 0.1% caffeine Appendix of results Caffeine concentrationtStandard deviationDegrees of freedomSignificance. 0.1 -Water1.7957.079Not significant 0.2 -Water 4.5761.979Significant 0.3 -Water6.7961.277Significant 0.4 -Water7.4261.982Significant 0.5 -Water7.6367.980Significant ·At 80 degrees of freedom the detailed pry (the 95% confidence limit) is 2.0 and the value of t (1.79) is less than this hence it is not significant. So any difference is due to chance. ·Comparing water with 0.2 caffeine and preceding(prenominal) the value of t is greater than the critical value and so the results are signifi cant... ! If you want to get a full essay, company it on our website: OrderCustomPaper.com

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