Interpreting Trend Lines Scatterplot

Weather conditions are recorded daily. The following scatterplot shows the dew point versus the maximum humidity for a given time period.

Which best describes the association shown in the scatterplot?

• Linear

• Increasing

• Non-linear

• Decreasing

Based on the scatterplot, which statement is a valid conclusion?

• As the dew point increases, the maximum humidity increases.

• As the dew point decreases, the maximum humidity decreases.

• As the dew point decreases, the maximum humidity decreases.

• There appears to be no association between dew point and maximum humidity.

Ms. Ellis' nine math classes investigated the link between regular handwashing and the incidence of flue. During the school year, 3 classes agreed to wash their hands 2 times each day, 3 classes agreed to wash their hands 4 times each day, and 3 classes agreed to wash their hands 6 times each day. The data from their investigation is shown on the graph.

Which best describes the trend shown in the graph?

• Positive trend

• Negative trend

• No trend

• Average trend

Which statement best describes the association of the scatterplot?

• The association of the data is non-linear

• The association of the data is linear

• The association of the data is absolute

• The data is not associated.

The noble gases from the period tabel are colorless, tasteless, and odorless gases that are virtually non-reactive. The relationship between atomic mass and density of the gases is shown in the scatterplot.

Which statement best describes the association that exists between the atomic mass and density of the noble gases?

• There is no association between the atomic mass and density of the noble gases.

• A positive, linear association exists between the atomic mass and density of the noble gases. As the atomic mass decreases, the density increases.

• A negative, linear association exists between the atomic mass and density of the noble gases. As the atomic mass increases, the density decreases.

• A positive, linear association exists between the atomic mass and density of the noble gases. As the atomic mass increases, the density increases.

Mr. Chen created a scatterplot to model the relationship between the number of questions on a test and student test scores on the test.

Which best describes the trend that exists between the number of questions on a test and the student scores?

• Positive trend

• Negative trend

• No trend

• Average trend

Based on Mr. Chen's scatterplot, which type of association exists?

• There is no association that exists between the number of questions on a test and student scores.

• A linear association exists between the number of questions on a test and student scores.

• A non-linear association exists between the number of questions on a test and student scores.

• An average association exists between the number of questions on a test and student scores.

Standardized assessment creators determine a final scale score for exams by determining the difficulty of each question. A mathematics assessment raw score versus scale score is shown.

Which best describes the trend shown in the scatterplot?

• No trend

• Positive trend

• Negative trend

• Not here

Which best describes the relationship between the raw scores and scale scores for this mathematics assessment?

• There is no association. As the raw scores decrease, the scale scores increase.

• There is a linear association. As the raw scores increase, the scale scores decrease.

• There is a linear association. As the raw scores increase, the scale scores increase.

• There is a non-linear association. As the raw scores increase, the scale scores decrease.

The Old Faithful Geyser in Yellowstone National Park was discovered in 1870. Old Faithful erupts every 35 to 120 minutes and the eruptions last between 1.5 and 5 minutes. The scatterplot shows several consecutive eruptions.

Which statement best describes the relationship between the duration and height of the Old Faithful Geyser eruptions?

• The data suggests an average association.

• The data suggests a positive, linear association.

• The data suggests a negative, linear association.

• The data suggests no association.