A control sample is the experiment under regular conditions. An experimental sample is the experiment in which different variables are changed.
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In a sample where the variable is not applied, the treatment group is still treated like other experimental groups except for the absence of the variable being studied. The treatment group should receive the same level of attention, resources, and procedures as the other groups, allowing researchers to compare the effects of the variable in question. This ensures that any observed differences can be attributed to the variable being studied rather than any disparities in treatment.
Each member of the population has the same probability of being in the sample as any other. Equivalently, any set of members of the given sample size has the same probability of being selected as any other set.
sample data drawn from one population is completely unrelated to the selection of sample data from the other population.
Two random samples are dependent if each data value in one sample can be paired with a corresponding data value in the other sample.
Microsoft Office offers sample timesheet templates, as does Google docs. There are also other online services that offer timesheet templates for download.