The ACT is an important exam for students seeking admission to college, and many schools use the Iowa Assessments to predict how well a student will perform on the ACT. This prediction is based on a regression equation that takes into account the student's current performance on the Iowa Assessments, their grade level at the time of testing, and correlational information about performance on the two assessments. 

The Iowa Testing Program conducted research to determine the relationship between performance on the Iowa Assessments and the ACT. The study analyzed data from 25,000 students who took both assessments, and found that the correlation between the two assessments was .8 for students in grade 11, the typical grade when students take the ACT for college admission. 

The study also found that the correlation between the Iowa Assessments and the ACT increases as the student gets closer to graduation. For students in grades 6 and 7, the correlation was .82, while for grade 8 it was .83. By grade 10, the correlation had increased to .86.


Overall, the Iowa Assessments can be a useful tool for predicting a student's performance on the ACT, particularly for students in higher grade levels. Schools can use this information to help prepare students for the ACT and to identify areas where students may need additional support.