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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 listens to classical music quietly 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 is missing from Elaina's scientific investigation?

Sagot :

Oseniidn

Answer:

Constant variables

Explanation:

Elaina's investigation lacked the critical ingredient of constant variables which are important components of every scientific investigation. In every research, there are 3 important variables, namely:

1. Dependent variables: the actual variable to be measured during the course of investigations and whose values are dependent on another variable (independent variable) supplied by the investigators.

2. Independent variable: one of the variables that are supplied by investigators whose values are often manipulated to see the kind of changes it will cause to the dependent variable.

3. Constant variables: other variables that are neither independent nor dependent but constant for all the various experimental groups in investigations.

Constant variable is the factor which is missing from the Elaina's scientific investigation.

Constant variable is a type of variable that does not change or remain constant in the experiment. Elaina has to keep the type of music same to all the individuals such as the rap music should be replaced by classical music. This variable should be maintained constant for all people who participated in the experiment, then we will obtain the right results from the experiment so we can conclude that constant variable is the missing factor.

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