2.) Check your answers! Always!
- Part A: Score It
- Essentially correct you need each of the following:
- 1. Provides a reasonable explanation for why the sample might not be representative of the population;
- 2. Mentions a link between the nonrepresentative nature of the convenience sample and the variable of interest (opinion about appearance of university buildings and grounds); CONTEXT
- 3. Indicates a plausible direction for the bias of the estimator by: o Explicitly identifying the direction of the bias in the estimate of the population proportion of students satisfied with the appearance of the buildings and grounds, OR o Stating or implying that the students in the sample were more (or less) likely to be satisfied with the appearance of the buildings and grounds than those not in the sample.
- Partially Correct P = 2 of these 3 components
- Part B: Score It
- Essentially Correct (E):
- 1. Assigns numbers to the student names;
- 2. Uses a random number generator to randomly generate 500 distinct/unique numbers between 1 and 70,000;
- 3. Selects students whose names correspond to the 500 random numbers for the sample.
- Partially correct (P) if the response correctly includes two of the three components listed above (with the exception of the second reason given for an (I) below).
- Incorrect (I) if the response correctly includes no more than one of these three components; OR if the response proposes implementing a sampling method other than simple random sampling (for example, systematic sampling)
- Part C: Score It
- Essentially correct (E) if:
- Response states that "if students' opinions about the appearance of buildings vary/differ more based on campus than they would based on gender it would be better to stratify by campus (than gender)."
Writing About Bias:
- Today we focused on writing about bias (AP FR)--check out some of the different responses below!
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