Read the article linked here: http://www.samj.org.za/index.php/samj/article/view/9298/6855
The researchers were concerned that the reference values for common blood cell counts used by South African laboratories were taken from research conducted on samples taken from population that did not reflect (could not be inferred to) the local population.Answer this question and those that follow. What type of study was this?
The blood samples were stored at 20 degrees Celsius, with a standard deviation of 4 degrees Celsius. If the data point values were normally distributed, with no statistical outliers, what does this imply?
To be entered into the study, participants had to be healthy. One of the criteria for classification as healthy was no prescribed medication (the baby / child should not be on any medication). If the data entry tool identified children that were not on medication as 0 (zero) and those on medication as 1 (one). Identify the data type for this variable.
Consider a possible follow-up study to this research, in which the same children were to be re-evaluated in five and again in 10 years. In the follow-up study researchers looked at their educational success and rates of certain illnesses. What study type would this represent.
The participants in this cross-sectional study were taken from the health clinics in one of the numerous informal settlements around a large city. What sampling technique would be describe this selection.