Statistics Review

Front

What does standard deviation represent?

Back

How spread out each data value is from the mean.

Front

What is the population in a survey of 976 American households where 32% own two cars?

Back

All American households.

Front

Find P(Male given Full Time) if there are 3 males and 10 full-time students.

Back

3/10.

Front

What is the probability P(Pizza Given Senior) if there are 10 seniors and 15 total students?

Back

2/3.

Front

What type of sampling is used when surveying all waiters and waitresses at 20 randomly selected restaurants?

Back

Cluster sampling.

Front

Define 'population' in statistics.

Back

The entire group of individuals or instances about whom we hope to learn.

Front

Define 'sample' in statistics.

Back

A subset of the population selected for analysis.

Front

What is the difference between descriptive and inferential statistics?

Back

Descriptive statistics summarize data, while inferential statistics make predictions or inferences about a population based on a sample.

Front

What does a p-value represent in hypothesis testing?

Back

The probability of obtaining test results at least as extreme as the observed results, assuming that the null hypothesis is true.

Front

What is a confidence interval?

Back

A range of values, derived from a data set, that is likely to contain the value of an unknown population parameter.