Statistics Assignment Example | Topics and Well Written Essays - 500 words - 2

Statistics - Assignment Exampleof industrial explosion and were under age 40 at the time of accident had heightened concentrations of dioxin in their blood and that each tenfold increase in dioxin level was associated with a doubling of the risk of breast cancer.a) In any experiments, it is required to select standard randomly. If the subjects were not assigned to the diets randomly instead of letting people pick what they wanted to tucker out, than there may be possibility of adding an different factor (in this courting subjects choice) introduced to the experiments. Thus, it will be difficult to say which factor influenced blood pressure more effectively, subjects choice what they wanted to eat or diet type.Randomization tout ensembleows us to equalize the effects of unknown or uncontrollable sources of variation. It does not eliminate the effects of these sources, but it spreads them out crosswise the treatment levels so that we can see past them.c) The researchers need the co ntrol group because than they will be able to compare the blood pressure of groups found on different diet only. If the DASH diet groups mean blood pressure was lower at the end of the experiment than at the beginning that would only mean that DASH diet lowered the blood pressure. This will not mean how much effective DASH diet is compared to other diets. Further, in an experiment it is required to control sources of variation other than the factors we are testing by making conditions as similar as possible for all treatment groups.d) We would need additional information standard error of difference (or sample standard deviations and sizes for DASH diet group and control group) in lay out to decide whether an average reduction in blood pressure of 6.7 points was statistically