'An Interesting study on how media uses numbers to obfuscate the truth.'
'An interesting study of how media uses numbers to obfuscate the truth.'
Both of the above sentences appear correct to me. ( When being used to demonstrate how media manipulates the truth by referring to a particular article as an example, context is broad & not limited to that one article; I would prefer to use - study on)
“study of” vs. “study on”
'An Interesting study on how media uses numbers to obfuscate the truth.'
'An interesting study of how media uses numbers to obfuscate the truth.'
Both of the above sentences appear correct to me. ( When being used to demonstrate how media manipulates the truth by referring to a particular article as an example, context is broad & not limited to that one article; I would prefer to use - study on)