Question 35 (1 point)

Which of the following would a regression line be used for?

Question 35 options:

a)	To estimate the change in variable y for a single unit change in variable x

b)	To determine if any of the variables labelled x are outliers

c)	To determine if any of the variables labelled y are outliers

d)	To determine if a change in variable y causes a change in variable x

Question 36 (1 point)

What is the middle value of an ordered array of numbers?

Question 36 options:

a)

Mode

b)

Midpoint

c)

Mean

d)

Median

Question 37 (1 point)

The sum of the deviations about the mean is always ________ .

Question 37 options:

a)

Positive

b)

Negative

c)

Zero

d)

The range

Question 38 (1 point)

Two dice are rolled. The dots are counted. What is the sum of the dots called?

Question 38 options:

a)

Constant

b)	Qualitative variable

c)	Discrete variable

d)	Continuous variable

Question 39 (1 point)

In statistics, what is a sample?

Question 39 options:

a)	All items under investigation

b)	A portion of the population

c)	A portion of the sample

d)	The population

Question 40 (1 point)

In a unimodal distribution, what can we say about the distribution if the mode is less than the mean?

Question 40 options:

a)	The distribution is positively skewed

b)	The distribution is negatively skewed

c)	The distribution is normal

d)	The distribution is symmetrical