A superintendent of a school district wants to understand the link between attendance and grade point average, or GPA. The GPA is out of \( 4.0 \) points, with \( 4.0 \) being the highest possible. The percent attendance and GPA of 30 randomly sampled students from the superintendent's district were collected. This sample data is provided below. Use Excel to calculate the correlation coefficient \( r \) between the two data sets. Round your answer to two decimal places.