Statistics - Assessing Normality

Another way to find a normal distribution

QQ Plot

QQ Plot takes precedence over histogram

TRUE

If R value is close to one…

It is linear

QQ Plot

How to confirm outliers

Use boxplot

What are QQ plots best for

Smaller data sets

What are histograms best for

Larger data sets

Number to determine unusual event

0.05

Normal curve characteristics

Area of the curve’s left and right BOTH equal 1/2

Normal curve’s highest point occurs at mean

TRUE

Area under the curve is

One

Normal Curve is symmetric or unsymmetric

symmetric

central limit theorem

states that regardless of underlying​ population’s shape, the sampling distribution of x becomes approximately normal as the sample​ size, n, increases

Sampling distribution

Every number comes from sample

Standard error of mean

Central Limit Theorem applies to

Large samples

You find SD of sampling distribution with what formula?

standard deviation divided by square root of sample size

What effect does sample size have on probability

Increase sample size → prob decreased due SD decreasing as sample size increases