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Which of the following is not a measure of variability?

Mode

Standard deviation

All of the answers on this list are measures of

variability!

Range

A scatter plot or scatter chart can be used to identify the association between variables.

According to Dr. Coy in the lecture video, if we can approximate the relationship with a line,

then there is probably a linear relationship between the two variables.

True

False

Unfortunately, if we wish to compute a table of descriptive statistics, we are forced to

calculate all of our statistics using individual Excel formulas. There are no shortcuts!

True

False

The confidencelevelin the descriptive statistics output tells us how much to add and

subtract from the mean to obtain the 95% confidence interval of the mean.

True

False

Match the clues with the answers at right.

A single

value of

each

variable

at a

given

time,

which

often

appears

as one

data row

in your

A

.

Bins

B

.

Normal

C

.

Time series

D

.

Sample

mean

E.Observation

F.Hypothesis

E.

Mode

Standard deviation

All of the answers on this list are measures of

variability!

Range

A scatter plot or scatter chart can be used to identify the association between variables.

According to Dr. Coy in the lecture video, if we can approximate the relationship with a line,

then there is probably a linear relationship between the two variables.

True

False

Unfortunately, if we wish to compute a table of descriptive statistics, we are forced to

calculate all of our statistics using individual Excel formulas. There are no shortcuts!

True

False

The confidencelevelin the descriptive statistics output tells us how much to add and

subtract from the mean to obtain the 95% confidence interval of the mean.

True

False

Match the clues with the answers at right.

A single

value of

each

variable

at a

given

time,

which

often

appears

as one

data row

in your

A

.

Bins

B

.

Normal

C

.

Time series

D

.

Sample

mean

E.Observation

F.Hypothesis

E.

spreadsh

eet.

Grouping

s used to

determin

e the

intervals

in a

frequenc

y

distributi

on.

An

example

is the

record of

closing

stock

prices for

Exxon for

the last

three

years.

A point

estimate

Comparin

g P-value

to the

research

alpha

This

distributi

on has no

skew

Test

Skew has to do with the direction of the longer tail of the distribution. If the skew is positive,

then the longer tail points to the right. For symmetrical distributions like the normal

distribution, the tails are identically sized and have, therefore, no skew.

True

False

It is possible that two variables could have a strong non-linear correlation but have a linear

correlation close to zero.

True

A.

C.

D.

F.

B.

eet.

Grouping

s used to

determin

e the

intervals

in a

frequenc

y

distributi

on.

An

example

is the

record of

closing

stock

prices for

Exxon for

the last

three

years.

A point

estimate

Comparin

g P-value

to the

research

alpha

This

distributi

on has no

skew

Test

Skew has to do with the direction of the longer tail of the distribution. If the skew is positive,

then the longer tail points to the right. For symmetrical distributions like the normal

distribution, the tails are identically sized and have, therefore, no skew.

True

False

It is possible that two variables could have a strong non-linear correlation but have a linear

correlation close to zero.

True

A.

C.

D.

F.

B.

False

if the data exhibits a bell-shaped curve, roughly 68% of the observations will be within

_____________.

3standarddeviationsof the mean.

2standarddeviationsof the mean.

1standarddeviationof the mean.

1.5standarddeviationof the mean.

I know that this question is about the empirical rule, but none of the answers

on this list are correct!

Histogramsare used to learn about the properties of a distribution. These properties can

include shape, skew and multiple modes (e.g., bimodal distribution).

True

False

Variance and standard deviation measure the same attribute of a distribution.

True

False

although correlations close to 1 or -1 are obviously strong, determining whether or not the

correlation between two variables is strong is context specific and somewhat subjectively

determined.

True

False

Which of the following correlation statistics is the strongest?

R

= -

12

%

R

=

41

%

R

= -

91

if the data exhibits a bell-shaped curve, roughly 68% of the observations will be within

_____________.

3standarddeviationsof the mean.

2standarddeviationsof the mean.

1standarddeviationof the mean.

1.5standarddeviationof the mean.

I know that this question is about the empirical rule, but none of the answers

on this list are correct!

Histogramsare used to learn about the properties of a distribution. These properties can

include shape, skew and multiple modes (e.g., bimodal distribution).

True

False

Variance and standard deviation measure the same attribute of a distribution.

True

False

although correlations close to 1 or -1 are obviously strong, determining whether or not the

correlation between two variables is strong is context specific and somewhat subjectively

determined.

True

False

Which of the following correlation statistics is the strongest?

R

= -

12

%

R

=

41

%

R

= -

91

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