A school district administrator sent a survey to all teachers in the district. Only 30 of the teachers responded to the survey. Which of the following is true?
I. The people that did not responded are likely to be similar to those that did so he should use them as the sample.
II. This survey design suffered from non-response bias.
III. Because he sent the survey to everyone, this is a census and the results can be applied to the whole population.
A) II only
B) I, II, and III
C) I only
D) I and II only
E) II and III only
Question 2
Which is true about randomized experiments?
I. Randomization reduces the effects of confounding variables.
II. Random assignment of treatments allows results to be generalized to the larger population.
III. Blocking can be used to reduce the within-treatment variability.
A) III only B) I, II, and III C) I only D) I and III E) II only
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