Bivariate: Association and Regress Line

A research is carried out to determine the link between the electricity bill of a home and the number of pets it has. The response variable is:

• ordinal.

• quantitative.

• the number of pets in the home.

• the electricity bill.

• the home's electricity usage.

In a study to determine if the number of hours spent on homework affects final grades in high school biology, which of the following statements is incorrect?

• The response variable is the final grade.

• The explanatory variable is the number of hours spent on homework.

• The grade is ordinal (like A, B, C, D, E)

• The response variable is numerical.

• The explanatory variable is numerical.

Tags

CCSS.HSS.ID.C.9

Observing a significant correlation between a nation's Gross Domestic Product (GDP) per capita and its energy consumption per capita, one might infer that:

• raising a nation's energy consumption will directly boost its GDP per capita.

• lowering a nation's energy consumption is a sure way to increase its GDP per capita.

• the observed correlation is random and should not be considered in policy making.

• nations with higher GDP per capita values are likely to exhibit higher energy consumption per capita.

• nations with higher GDP per capita values are likely to exhibit lower energy consumption per capita.

Tags

CCSS.HSS.ID.C.9

Is it logical to conduct a research where the secondary variable is considered as the explanatory variable? Provide a justification for your response.

If a group of high school students were observed, what other factor could explain the relationship between their heights and weights?

Draw the line of good fit based on the scatterplot.

Tags

CCSS.8.EE.B.5

Describe the scatterplot's characteristics in terms of its direction, shape, and the strength of the relationship.

Groups:

(a) direction

,

(b) shape

,

(c) strength

• negative

• linear

• weak

Tags

CCSS.HSS.ID.B.5

Describe the scatterplot's characteristics in terms of its direction, shape, and the strength of the relationship.

• The scatterplot shows a negative direction, linear shape, and a strong relationship.
• The scatterplot shows a positive direction, curvilinear shape, and a weak relationship.
• The scatterplot shows a positive direction, linear shape, and a strong relationship.
• The scatterplot shows a negative direction, curvilinear shape, and a weak relationship.

Tags

CCSS.HSS.ID.B.5

Besides yearly precipitation levels (rain), what additional factor might influence the bushfire frequency?

State the explanatory variable