The process used to ensure that the results gained are valid and reliable.

Again, measurement involves assigning scores to individuals so that they represent ... But if it indicated that you had gained 10 pounds, you would rightly conclude that it was ... Assessing test-retest reliability requires using the measure on a group of people ... The assessment of reliability and validity is an ongoing process.                                                                                     Explanation:

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d

70 % i think is the answer.