Random Simulation Sampling Methods Types of Bias Experimts. & Studies

A large manufacturer of batteries knows that, historically, 3% of its batteries come off the production line defective, and the remaining batteries are in working condition. How could you assign numbers for a simulation to estimate the number of defective batteries in a box of 50?

(possible answer) 0-2: defective 3-99: working

Assume 10% of cars need need mechanical work in the first five years. Using 0: need work, 1-9: working fine, complete and summarize 2 trials to estimate the number of cars needing work out of 12. **Use one line per trial

Based on the simulation, there would be an average of 1.5 cars need work.

Sam is taking a quiz with 10 multiple choice questions. If he were to just guess on each question, assign numbers for a simulation to find the probability that he passes the quiz.

(Possible answer) 0: correct 1-3: incorrect

Suppose the underdog has a 30% of winning any given game. Using 0-2 for an underdog win, conduct a simulation of 4 trials to find the probability that they win a 3-game series. **Use one line per trial

Based on the simulation, the underdog has a 25% chance of winning the series.

Sally is a 65% free-throw shooter. Find the simulated probability that she makes 2 out of 2 on the line. **Use consecutive numbers for 5 trials

Based on the simulation, Sally has a 40% chance of making both shots.

Which sampling method is used? Ask every 50 th person in line for the football game.

Systematic

Which sampling method is used? Randomly select 2 students from every class

Stratified

DAILY DOUBLE

Which sampling method is used? Put a survey in the school newspaper and have students turn them in to the office.

Voluntary Response

Which sampling method is used? Survey your twitter followers

Convenience

Which sampling method is used? Randomly select 5 teachers and survey everyone in those classes.

Cluster

Which type of bias is most likely to result from this sampling method? Call parents’ home phones while they are at work

Nonresponse

Which type of bias is most likely to result from this sampling method? Put a survey in the school newspaper and have students turn them in to the office.

Voluntary Response

Which type of bias is most likely to result from this sampling method? Randomly select 5 teachers and survey everyone in those classes.

Undercoverage

Which type of bias is most likely to result from this sampling method? Randomly select 50 student ID numbers from Synergy.

None

Which type of bias is most likely to result from this sampling method? In a survey, ask students to mark whether they are satisfied, dissatisfied, or very dissatisfied with the quality of food in the cafeteria.

Response

What is a placebo used for?

Control group; baseline measurement

Doc McStuffins asked her patient about what he had been eating lately. This is an example of what kind of study?

Retrospective

Splitting subjects into different age groups before randomly assigning treatments is an example of what element of experimental design?

Blocking

Giselle is experimenting with two new exercise methods. She randomly assigns both methods to a group of freshman boys and then to a group of freshman girls. It will be hard for her to analyze the results because age will be _____ with gender (one word).

Confounded

Researchers conducted an experiment on a new dietary supplement and results showed that the weight loss was statistically significant for those using the supplement. This means that the differences in weight loss (for supplement v. non-supplement was more than you’d expect from _____ alone. (2 words)

Natural Variation or Random Chance

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