Dr. Gray would like to do a survey on whether the proportion of people ages 18 to 22 who have seen a healthcare professional (doctor, nurse, hospital, etc.) in the past year is higher than the national average of 82%. She plans to give her survey to 80 student athletes at your college by distributing surveys after sports practice. Is this survey valid or not valid for testing the hypothesis that the proportion of people ages 18 to 22 who have seen a healthcare professional in the past year is higher than the national average? Not Valid O Valid