Exploring Scatter Plots and Trend Lines

What is a scatter plot?

• A bar graph

• A detailed map

• A graph of points representing two sets of data

• A type of pie chart

What does a positive correlation in a scatter plot indicate?

• Data points decrease as values increase

• No relationship between the data points

• Data points increase as values increase

• Random distribution of data points

Why are the points in scatter plots not connected?

• To indicate continuous data

• To avoid implying data where there is none

• To create a more visually appealing graph

• Because it is easier to plot

What does the correlation coefficient R indicate?

• The type of variables plotted

• The strength and direction of the relationship between variables

• The color scheme of the scatter plot

• The numeric value of each data point

What is the range of the correlation coefficient R?

• 0 to 1

• -100 to 100

• -1 to 1

• 0 to 100

What does an R value close to 1 signify?

• Strong positive correlation

• No correlation

• Strong negative correlation

• Weak correlation

What does a negative slope in a scatter plot's trend line indicate?

• Negative correlation

• Positive correlation

• No correlation

• Data inconsistency

How do you determine a best fitted line on a scatter plot?

• By drawing a line that closely fits most of the data points

• By coloring in all the points

• By selecting the highest and lowest points

• By drawing a circle around all data points

What is the first step in writing the equation of a best fitted line?

• Calculating the midpoint

• Finding the slope

• Choosing a color for the line

• Labelling the axes

How is the y-intercept determined when calculating the equation of a trend line?

• By measuring the distance from the origin

• By using the slope and one point on the line

• By finding the average of all y-values

• By extending the line to the y-axis