Scatter Plots and Trend Line Equations

The daily attendance at a bowling alley was recorded for 15 days. The scatterplot shows the number of lanes rented each day and the number of people who bowled that day. Which statement is best supported by the scatterplot?

• There is a non-linear association between the number of lanes rented and the number of people who bowl.

• There is a negative linear association between the number of lanes rented and the number of people who bowl.

• There is no apparent association between the number of lanes rented and the number of people who bowl.

• There is a positive linear association between the number of lanes rented and the number of people who bowl.

Based on the graph, if Joe earned $400, how many hours did he work?

• 25 hours

• 35 hours

• 45 hours

• 15 hours

Julie made 25 international long-distance phone calls to London last month. The scatterplot below shows the length and cost of each phone call she made. Which conclusion is best supported by the scatterplot?

• As the length of a call increases, the cost of the call increases.

• As the length of a call increases, the cost of the call remains the same.

• As the length of a call increases, the cost of the call decreases.

• There is no relationship between the length of a call and the cost of a call.

What type of correlation exists between days and weight of Mr. Hampton's exercise plan?

• positive correlation

• negative correlation

• no correlation

Which statement describes the relationship between days and weight?

• as the days go by, the amount of weight slightly decreases

• as the days go by, the amount of weight slightly increases

• it is unpredictable what will happen to the weight over time

What is an "outlier" in a scatter plot?

• a data point that does not fit the trend/average

• a line that goes through the data points in a scatter plot

• a child who does not tell the truth when playing outside

• an equation that predicts the trend

Which graph shows a correctly drawn trend line or line of best fit?

• A

• B

• C

• D

What correlation exists between days and the height of the plant?

• positive correlation

• negative correlation

• no correlation

• quadratic correlation

Use the trend line to give the best prediction for the height of the plant at 25 days?

• 10 cm

• 15 cm

• 18 cm

• 25 cm

There is no correlation between the cost of the person's cell and the number of text messages they send per day. What does that mean?

• the more expensive a phone is, the more text messages a person will likely send

• the more expensive a phone is, the fewer text messages a person will likely send

• you cannot predict the number of text messages a person sends based on the cost of their phone

• X-Box and Play Station