Video Quiz: Confidence Intervals and Margin of Error

What is the main reason pollsters sample the population instead of asking every likely voter?

• To save time and resources

• To reach a larger audience

• Because it's more accurate

• To avoid influencing the election outcome

What does the sample proportion represent in this context?

• The percentage of the entire population that supports Candidate A

• The percentage of sampled voters that support Candidate B

• The likelihood that Candidate A will win the election

• The percentage of sampled voters that support Candidate A

What statistical concept allows us to estimate the population proportion?

• Sample proportion

• Population mean

• Sampling distribution

• Sample mean

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-3

What shape is the sampling distribution of sample proportions assumed to have?

• Skewed

• Uniform

• Normal

• Bimodal

What is the standard deviation of the sampling distribution of the sample proportions known as?

• Margin of error

• Population standard deviation

• Sample standard deviation

• Standard error

What is used as an estimate for the population proportion when it is unknown?

• Population mean

• Population proportion

• Sample proportion

• Sample mean

What does a 95% confidence interval indicate?

• 95% of the population falls within this interval

• The sample proportion will always be within this interval

• There is a 95% probability that the population proportion falls within this interval

• Candidate A has a 95% chance of winning

How can the margin of error be decreased?

• By decreasing the sample size

• By increasing the sample size

• By sampling only likely voters

• By using a different sampling method

What is the margin of error in the context of this election poll?

• The error made by not sampling the entire population

• The difference between the sample proportion and the population proportion

• The range of values within which the true population proportion is expected to fall

• The percentage of the sample that might not support either candidate

What does increasing the sample size directly impact?

• The population size

• The population proportion

• The sample proportion

• The standard error

Tags

NGSS.HS-LS3-3