Analyzing Line of Best Fit and Correlation Coefficient

What is the main topic of the tutorial?

• Graphing sine and cosine functions on a TI-84 calculator.

• Calculating integrals on a TI-84 calculator.

• Solving quadratic equations using a TI-84 calculator.

• Finding the equation for a line of best fit and the correlation coefficient on a TI-84 calculator.

Which mode option needs to be turned on to prepare the TI-84 for statistical calculations?

• Stat Diagnostics

• Graphing Mode

• Function Mode

• Table Mode

How do you clear a list in the TI-84 calculator?

• Press the Delete button.

• Highlight the list and press the Clear button.

• Highlight the list and press the Enter button.

• Press the Reset button.

What must be ensured when entering points for a scatterplot?

• X values and Y values must be entered in separate lists.

• X values and Y values from each point must be side-by-side.

• Only X values need to be entered.

• Only Y values need to be entered.

Which button combination is used to access the stat plot feature on the TI-84?

• 2nd + Y=

• 2nd + Mode

• 2nd + Graph

• 2nd + Stat

What type of graph should be selected to create a scatterplot?

• Bar Graph

• Histogram

• Scatterplot

• Box and Whisker Plot

What should be adjusted if the scatterplot goes off the window?

• The window settings.

• The calculator mode.

• The type of graph.

• The color of the dots.

What does the correlation coefficient indicate?

• The type of graph used.

• The color of the scatterplot.

• The strength and direction of the linear relationship between the points.

• The exact position of each point.

What is the formula for the line of best fit provided by the TI-84?

• y = cx + d

• y = bx + a

• y = mx + c

• y = ax + b

What does a correlation coefficient of 0.81 indicate about the points?

• The points are perfectly aligned.

• The points are randomly scattered.

• The points are not related at all.

• The points are fairly close to the line of best fit.