AP Stats 3.1 Quiz - Pamela Padilla | Biblioteka

3

Select ALL that apply. You can describe the overall pattern of a scatterplot by the…

Strength

Form

Shape

Direction

1

What does correlation measure?

Strength

Shape

Form

Direction

1

correlation is NON-resistant to extreme observations

Tačno

Netačno

Below is a scatterplot relating systolic blood pressure and age for 14 men from 42 to 67 years old. Use the scatterplot to answer questions #4-10.

1

Is there a clear explanatory variable and response variable in this setting?

Yes, the explanatory variable is Age and the response variable is Systolic Blood Pressure (SBP)

Yes, the explanatory variable is Systolic Blood Pressure (SBP) and the response variable is Age

No , the scatterplot does not show a clear explanatory and response variable

2

Does the scatterplot show an association? If so, explain the association.

1

What is the form of the relationship?

Exponential

Linear

Quadratic

Difficult to tell from the scatterplot

1

Which of the following is closest to the correlation between systolic blood pressure and age for this group of 14 men? Explain your reasoning where it says "Show your work"

1

There is one “unusual point” on the graph. Explain what is “unusual” about this subject.

1

What effect would removing the “unusual point” have on the correlation?

Removing the unusual point would not change anything.

Removing the unusual point would make the correlation stronger with an r value closer to 1

Removing the unusual point would make the correlation weaker with an r value closer to 0

Removing the unusual point would make the correlation stronger with an r value closer to -1

1

Suppose we rescaled the ages so that they were expressed as number of years above (+) or below (–) 50 years old. That is, suppose we subtract 50 from each value. How would the correlation change? Explain

The correlation value of r would increase, closer to 1, making it stronger

The correlation value of r would decrease closer to -1, making it stronger

The unit of measurement for the value of r would change to pounds as well

The value of r would not be affected by the subtraction