Which of the following best summarizes nonresponse bias?
1.a tendency for samples to differ from the corresponding population as a result of systematic exclusion of some part of the population
2.a tendency for samples to differ from the corresponding population because data are not obtained from all individuals selected for inclusion in the sample
3.a tendency for samples to differ from the corresponding population because the method of observation tends to produce values that differ from the true value
4.a bias on the part of the researcher towards those who chose not to participate in a survey
5.None of these describes nonresponse bias.
Question 2
Which of the following statements is false?
1.The explanatory variables are those variables that have values that are controlled by the experimenter.
2.The response variable is the variable that the experimenter thinks may be affected by the explanatory variables.
3.An experimental unit is the smallest entity to which a treatment is applied.
4.Two variables are confounded if their effects on the response variable can be distinguished.
5.An experiment in which experimental units are randomly assigned to treatments is called a completely randomized experiment.
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