Samples and Margin of Error

Front

What is at the beginning of all confidence statements?

Back

In 95% of random samples.

Front

What type of sample is created when a representative walks around the mall interviewing people?

Back

Convenience sample.

Front

What does the parameter describe?

Back

The population.

Front

If a survey found that 77% of high schoolers use their phones more than 4 hours a day with a margin of error of 3%, what is the expected truth interval for the population?

Back

74% - 80%.

Front

What is the sample size in a survey that interviewed 1025 women?

Back

1025.

Front

Define 'margin of error'.

Back

The range within which the true population parameter is expected to fall.

Front

What is a 'random sample'?

Back

A sample that is selected randomly from the population, giving each individual an equal chance of being chosen.

Front

What is a 'voluntary response sample'?

Back

A sample where individuals choose to participate, often leading to bias.

Front

What is a 'weighted sample'?

Back

A sample that gives different weights to different responses based on their importance.

Front

What does a confidence level of 95% mean?

Back

It means that if we were to take many samples, 95% of the confidence intervals would contain the true population parameter.