Quant Exam 2 Review

This scatterplot shows a...

If we increase sample size, the standard error of the mean decreases (goes down)

The higher the value of r, the closer our predictions will be to actual values of Y (or X)

What is the z-score of x = 12, if it is two standard deviations to the right of the mean?

Standard Error of the Mean (SEM) is a measure of sampling error

Why can't correlation equal causation?

In a normal distribution, all of the scores above the mean account for

What does this graph show as a factor influencing Pearson r

Once a correlation is established, we can conclude cause and effect

Which of the following represents a moderate relationship?

What percentage of scores fall below -1 SD

Probability can tell us whether our result is "true" with absolute certainty.

A z-score is the number of standard deviations a value is from the mean

Covariance refers to how much X & Y vary separately

Inferential statistics help us reason about the uncertainty that comes from sampling a population

We use sample statistics to make inferences about population...

I want to find the proportion of scores above z = -1.5, I should look at the "area beyond z"

A baker is deciding how many batches of muffins to make. What is the probability the baker will sell at least 3 batches?

Sampling without replacement allows for a true random sample