2/21: Scatter Plots and Data Unit Test

Which is a true statement about two numerical sets of data that have negative association?

• As one variable increases, the other variable does not change.

• As one variable increases, the other variable increases.

• As one variable decreases, the other variable decreases.

• As one variable increases, the other variable decreases.

Which of the following is NOT a true statement about scatter plots A and B?

• Only scatter plot A shows negative association.

• Neither scatter plot appears to have any outliers.

• Scatter plot A has a stronger association than B.

• Only scatter plot A shows linear association.

Write an equation in slope-intercept form for the trend line shown on the scatter plot below.

The scatter plot shows the number of days since several people filled their cars with gas and the gallons of gas in their tank. Which is the most reasonable estimate of the gallons of gas in a tank if it has been 3 days since filling up?

• 13 gallons

• 17 gallons

• 23 gallons

• 10 gallons

Which scatter plot shows both positive and linear association?

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Which variables would the scatter plot shown be most likely to represent?

• The number of siblings a person has and the person’s GPA

• The number of guests at a hotel and the total water consumption

• The total number of miles driven and the total gallons of gas used

• The number of people at a concert and the total concession sales

The table shown shows the average temperature during the day and the number of snow cones sold for several days.

What type of graph would best represent this data?

• Positive

• Negative

• None

The table below shows the average temperature during the day and the number of snow cones sold for several days. Which is true about the association seen in the data?

• The association is positive and non-linear.

• The association is positive and linear.

• The association is negative and linear.

• The association is negative and non-linear.

Are there any outliers in the data shown?

• Yes; (93, 500) is an outlier since it is the greatest data point.

• Yes; (66, 250) is an outlier since it is the lowest data point.

• Yes; (88, 301) is an outlier since it does not fit the general trend of the data.

• No; there are not any outliers in the data.

A scatter plot was made to show the number of homes in a town based on the year. A trend line was drawn on the graph with an equation of y = 84x + 625, where x is the number of years since 1995 and y is the total number of homes in the town. Predict the number of homes in the town in 2015. (Hint: how many years in between)

• 2,005 homes

• 2,425 homes

• 2,305 homes

• 2,185 homes