This is because the choice of specific buildings is not adequately randomized. Without full randomization, even the overall vacancy rate is not entirely reliable. Thus, the sampling method can be improved by randomizing every aspect of the study.
c. The population in this study is welfare clients. The sampling frame is national. While the randomization draws from multiple states, the end figure in the study is not going to have this state breakdown. However, if average welfare assistance by state is derived, then the state would also be a sampling frame for this study. The unit of analysis is the individual, since at the end of the study a per individual dollar figure will be derived. The type of sample is random, because the individuals are chosen simply on the basis of their walking through the door, and the individuals did not know that the time they walked through the door would include...
This study is adequate, if somewhat flawed. The thirteen states are not chosen at random, which leaves that process open to cherry-picking of states to be used for the data. There is still for bias in the state selection. The individuals, however, are randomized. The method is good because it is designed to be relatively free from bias and there is randomization of the individuals, but there is room for improvement because the process is not randomized throughout.
2. The 95% confidence interval is the normal confidence interval in statistical testing. It means that 95% of samples can be expected to contain the mean. A 95% confidence interval equates to twice the standard deviation. Accuracy is the degree of conformity of a measured or calculated quantity to its true value. This means that the researcher observes that the study results are within 69% of…
