Sampling, Bias & Experiments - Review

In order to select a random sample of homes in Fresno, a polling company randomly selects 10 streets from a list of all streets in the city and surveys all houses on those 10 streets. This is an example of which of the following sampling methods?

• Simple Random Sample

• Cluster Sample

• Stratified Random Sample

• Systematic Sample

• Convenience Sample

An in-person survey in which respondents were asked if they voted in the most recent election is likely to suffer from _________ bias if the respondents feel embarrassed about no voting.

Which of the following describe the difference between an observational study and an experiment. Mark all that apply.

• Experiments utilize randomization when selecting participants, while observational studies do not

• Causation can be determined from an experiment, but not an observational study

• Experiments tend to have a larger number of participants than do observational studies

• Experiments use multiple methods to reduce the impact of confounding variables, while observational studies do not

A store manager designs an experiment to determine if the manner in which customers are greeted at the door has any impact on how much they spend. Customers who enter the store are greeted in one of 5 different ways and then their purchases are recorded and compared. This experiment has ________ factor(s).

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

A health-science company designs an experiment to determine if listening to motivational speeches before working out has an impact on the length of the workout. The company decides that if a person has previously played a sport, it may impact how long they are willing to work out. In order to eliminate variability due to previous experience with sports, subjects will first be divided into a "sports" and "non-sports" group and then randomly assigned one of the two treatments. Which of the following best describes the design of this experiment?

• Completely Randomized

• Randomized Block

• Observational Study

• Matched-pairs

• Two-factor

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5