8.1/8.2 Practice

Front

What happens to the margin of error when the sample size decreases?

Back

The margin of error increases.

Front

What type of study involves comparing a new product against a competitor's product by observing preferences?

Back

Experimental Study.

Front

What sampling method is used when every 10th student is interviewed?

Back

Systematic sampling.

Front

What are the two essential characteristics of a survey?

Back

A survey should always be random and unbiased.

Front

What type of study is conducted when a random sample of students is asked about their arrival times?

Back

Survey.

Front

Define 'margin of error' in the context of statistics.

Back

Margin of error is the range of values above and below the sample statistic in a confidence interval.

Front

What is the difference between an observational study and an experimental study?

Back

An observational study observes subjects without manipulation, while an experimental study involves intervention or manipulation of variables.

Front

What is a random sample?

Back

A random sample is a subset of individuals chosen from a larger set, where each individual has an equal chance of being selected.

Front

What does it mean for a survey to be unbiased?

Back

An unbiased survey does not favor any particular outcome and accurately represents the population.

Front

What is the purpose of conducting an experimental study?

Back

To determine the effect of one variable on another by manipulating the independent variable.