DATA ABOUT VALIDATION MEDIA WITH AIKEN FORMULA
This validation will be carried out with 9 experts, namely 1 chemistry expert, 1 learning technology expert, 1 AR learning media expert, and 6 teacher practitioners. Content validity was developed to improve the measuring instrument through checking the items on the measuring instrument. Content validity is based on the extent to which the content of the test can describe the attributes to be measured in the test. In this study, content validity was determined using the Aiken formula, which is as follows: V = S / [n*(c-1)] where S = ni (r-ℓo) (Aiken, 1985: 955) Where: V = validity index of Aiken ni = number of raters (raters) who choose criteria i c = number of categories/criteria r = criterion to i o = lowest category n = total number of raters Aiken's V coefficient value ranges from 0 – 1 and the criteria used to declare an instrument is said to be content valid on the number of raters (appraisers) as many as 9 people with 5 criteria determining validity is 0.72 (Aiken, 1985: 134).