Unit 4

Question 1

Observational study:

Answer 1

Researcher simply observes the units and measures variables of interest.

Question 2

Experimental units:

Answer 2

The objects on which our experiment is being conducted.

Question 3

Subjects:

Answer 3

If the experiment is done on humans, they are referred to as subjects.

Question 4

Treatments:

Answer 4

A specific experimental condition applied to the units.

Question 5

Response variable:

Answer 5

Variable that is measured following the application of treatment.

Question 6

Factors:

Answer 6

The explanatory variables in an experiment.

Question 7

Levels:

Answer 7

Individual values of the factors.

Question 8

An experiment that uses randomization to assign the treatments to the experimental units and observe the effects of the treatment is known as a __________________.

Answer 8

Randomized comparative experiment.

Question 9

Completely randomized design (CRD):

Answer 9

Treatments are randomly assigned to the experimental units.

Question 10

Double blind experiment:

Answer 10

The subject and person administering the treatment do not know which treatment is being applied.

Question 11

A ______ is a group of experimental units that are similar in a way that may affect the responses.

Answer 11

Block.

Question 12

A _____________ design is when the subjects are divided into blocks and treatments are assigned at random within the blocks.

Answer 12

Randomized block.

Question 13

Matched pairs design:

Answer 13

Subjects are grouped into pairs, based on some blocking variable and treatments are randomly assigned to subjects in each pair.

Question 14

Populations have ________, samples have __________.

Answer 14

Parameters, statistics.

Question 15

What shape of density curve do you use for uniform distribution?

Answer 15

A rectangle.

Question 16

A sample mean is represented by:

Answer 16

X bar.

Question 17

A population mean is represented by:

Answer 17

u

Question 18

A sample standard deviation is represented by:

Answer 18

s

Question 19

A population standard deviation is represented by:

Answer 19

o

Question 20

How do you find the height on a rectangle density curve?

Answer 20

Height = 1/width

Question 21

When do we use the bell curve?

Answer 21

When there is a normal distribution.

Question 22

A “standard normal distribution” means use a _____ curve.

Answer 22

Z-bell

Question 23

What is the formula for standardizing to z? (When given, x, u, and o)?

Answer 23

Z = x - u/o

Question 24

List the steps of solving a problem with a standard normal distribution ( Z - bell curve):

Answer 24

• Find the z score.
• Check table A.
• Is it left side? Then use value. Right side? 1 - value.
• This is your proportion.

Question 25

List the steps of solving a problem with a normal distribution (X - Bell curve):

Answer 25

• Standardize using z=x-u/o.
• Find the z score.
• Check table A.
• Left side? Use value. Right side? 1 - value.
• This is your proportion.

Question 26

When you see this “

Answer 26

The arrow points to the left, so shade left.

Question 27

When you see this “>” where do you shade?

Answer 27

The arrow points to the right, so shade right.