Term Test 2

Question 1

Describe the t distribution (relative to the z distribution)

Answer 1

Essentially the same as the z distribution, but using estimates instead of population parameters

Question 2

As sample size increases, the t distribution approximates…

Answer 2

The z distribution

Question 3

Define degrees of freedom

Answer 3

The number of independent, moving parts of a system which specify which t distribution you use

Question 4

What is the formula for the t distribution?

Answer 4

Question 5

Describe how the t distribution is really a family of distributions

Answer 5

Each t with degrees of freedom has a very slightly different distribution

Question 6

The sum of all deviations of a normal distribution is…

Answer 6

Zero

Question 7

What is a critical value (of a t distribution, for example)

Answer 7

For a given degree of freedom at a chosen alpha value, we identify a critical value at which a value above or below this will be considered abnormal

Question 8

What is the formula for making an exact 95% CI for a given critical value of t

Answer 8

Where the critical value is usually not too far from 2 ish