(01.01 HC)After researching the possible effects of music, E…
(01.01 HC)After researching the possible effects of music, Elaina proposes that if people listen to faster-paced music, their pulse rates will increase more than if they listen to slower music. Her mother listens to classic rock at a high volume for 30 minutes, her younger brother quietly listens to classical music while he sleeps at night, and her grandmother listens to two hours of rap at a medium volume. Elaina records each person’s pulse before and after listening to the music.What can you infer is missing from Elaina’s scientific investigation?