Analyzing Data and Statistics : Algebra II

A claim about a characteristic of a population is a

What percent of the normal distribution lies within 2 standard deviations of the mean?

A collection of data such as responses, measurements or counts that you want information about

In this preferred sample type each member of a population has an equal chance of being selected

This formula transforms x-values from a normal distribution to a standard normal distribution

Statistics has 2 major parts: Descriptive - where data is organized, summarized & displayed and

Methods of collecting data include experiments, observational studies, surveys and

In these experiments subjects are randomly assigned to the control group or the treatment group

This probability distribution graph is a bell-shaped curve which is symmetric about the mean

Questions that are flawed in a way that leads to inaccurate results are called

A sample that over-represents or under-represents part of a population

When 2 groups are studied under identical conditions with the exception of one variable.

A numerical description of a population characteristic is a

A numerical description of a sample characteristic

What percent of a normal curve lies within 1 standard deviation of the mean?

When a random sample of size n is taken from a large population the Margin of Error =

An important part of an experiment is sample size. To improve it's validity what also is needed