Unit 1: Statistics Review

When 3001 voters were polled, 73% said they were voting "yes" on an initiative measure. What is the margin of error (round to nearest tenth)?

When 1376 voters were polled, 82% said they were voting "yes" on an initiative measure. What is the margin of error (round to the nearest tenth)?

A survey of 850 people reported that 42% favored the re-election of the current governor. Find the range that is given by a 95% confidence interval (round to the nearest tenth).

Identify the population, the sample, and the sample proportion.

"A survey of 1353 American households found that 18% of the households own a computer."

• Trick Answer

• 1353

• Population

• Computers

• Sample Proportions

• .18

• Sample

• American households

Decide which method of data collection you would use to collect data for the study (observational study, experiment, simulation, or survey).

Groups:

(a) Observational Study

,

(b) Experiment

,

(c) Simulation

,

(d) Survey

• A study of salaries of college professors in a particular state.

• A study of the effect of koalas on Florida ecosystem

• A study of the effects of a fertilizer on a soybean crop

• A study where you would determine the chance of getting three girls in a family of three kids

• A study where a political pollster wishes to determine if his candidate is leading in the polls

What is the mean of the following set of data?

{70, 71, 65, 60, 62, 68, 67, 68, 70, 73, 60, 61, 61, 65, 64, 68, 69, 69, 63, 65}

What is the mode for the following set of data?

John scored a 92 on a math exam where the class mean was 82 and the standard deviation was 6. What was his z-score (round to nearest hundredth)?

According to the Empirical Rule, match the standard deviation range with the appropriate confidence interval.

• 95.4%

• -3σ to +3σ

• 68.2%

• -1σ to +1σ

• 99.8%

• -2σ to +2σ