How can a test be reliable but not valid? How can a test be valid but not reliable? What is the difference between the two terms? Why is validity and reliability  important Create on word document  double space 1 inch margin all paragraphs indented.  No title page no name on paper  Times New romans 12 fonts Discuss topic indept  no spaces between paragraphs  length of paper 1 1/2  no website quotes  no cited references no coping work from sites.