When drawing a line of best fit by 'eye-balling' it, which of the following is the most important guideline to follow?

The line must pass through the origin.

The line should connect the first and last data points.

The line should have about the same number of points above and below it.

The line must pass through at least two of the data points.

Data is collected on the number of hours a person spends weightlifting per week and their overall muscle mass. If a positive association exists, what would the trend line look like?

A line sloping downwards from left to right.

A line sloping upwards from left to right.

To connect all the data points in order.

To calculate the average of the x-values and y-values.

To provide a simple visual summary of the relationship between two variables.

To identify the exact minimum and maximum data points.