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# Conducting a Study and Statistics Planning Practice Questions (page 2)

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Updated on Oct 5, 2011

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1. a. Only people with telephones could participate in the survey. People without telephones may be less likely to shop outside the city, causing the mean number of times people who shop outside the city to be underestimated.

b. People might want to show support for their city, causing how often they shop outside of the city to be underestimated.

c. People with lower incomes who can't afford to shop very often might be more reluctant to participate, causing the mean number of people who shop outside the city to be underestimated.

2. Measurement or response bias: She tends to undercount the birds farther from the track causing her to underestimate the average number of each kind within a ten-square yard area.
3. a. The cholesterol level of a participant after one month

b. The people who participated in the study, narrow scope of inference

c. Cause-and-effect conclusions can be made to determine the effect of the standard medication versus the effect of the recently developed medication

d. Experiment, narrow scope of inference

4. a. Whether or not the customers would be willing to pay more

b. All customers of the cable television company, broad scope of inference

c. Associations can be concluded for the population as to whether or not people would be willing to pay more if a new set of channels was added.

d. Sample survey

5. a. The number of correct responses from the students when shown the letters

b. The students in the class, narrow scope of inference

c. Cause-and-effect conclusions cannot be made.

d. Observational study

6. a. The time required to clean the teeth

b. All patients who have their teeth cleaned at this large dental school during this six-month period, broad scope of inference

c. Cause-and-effect conclusions can be made.

d. Experiment, broad scope of inference

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