Saturday, December 14, 2013

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

Investigation in to the publication of caffein concentrations on water flea rawness set. 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 ( irrigate)144104124This is what theyre likend to. I will employ the learner t-test to comparability the means of the mean of deuce 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 guess is true. This photo labels where the parts you should look out for in the cyclops Results of experiment Null hypothesis ·There will be no significant effect on the heart rate of the daphnia as the caffeine concentration increases. ·I excite decided to use the student t-test as it allows the comparison of two different sets of data. t-test x1 - x2 t = -------------------- ---------------- S1 2 + S22 n1 n2 Where S1 = first take 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 quantity deviation) n = size of sample. x Formula of x = ----------- n ( x )2 x2 - -------- Formula of S2 = -------------------------- n - 1 Pond pissing compared with 0.
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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 -Water7.4261.982Significa nt 0.5 -Water7.6367.980Significant ·At 80 ! degrees of freedom the detailed regard as (the 95% confidence limit) is 2.0 and the value of t (1.79) is less than this hence it is not significant. So whatever difference is due to chance. ·Comparing water with 0.2 caffeine and higher up the value of t is greater than the critical value and so the results are significant... If you want to get a full essay, state it on our website: OrderCustomPaper.com

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