You want to know if the average number of hours slept at night affects a person's GPA. You ask 3 friends to record the hours they sleep for a week, and then you compare their GPA's. To make this
study better (more valid) you should
collect sleep data for more than 1 week
choose people randomly, not just your friends
Ο Ο Ο Ο
all of these are correct
get data from more people

i think the answer is gold im not entirely sure

it is either c or d and i know for sure it is not a or b

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called