An experimenter tests the hypothesis that physical exercise improves mood. subjects in the experimental group participate on monday and tuesday and those in the control group on wednesday and thursday. what is the extraneous (confounding) variable?
a. the exercise
b. the day of the week
c. the hypothesis
d. the mood (degree of happiness)

B. The day of the week                                                                            

Explanation:

Extraneous variable: In a psychological experiment, the term extraneous variable is also denoted as confounding variable and is defined as a variable that an experimenter or researcher is not studying intentionally or purposefully while conducting an experiment or research. The extraneous variable is the variables that are considered as undesirable in an experiment and it could affect the data being collected negatively.

In the question above, the extraneous variable is the day of the week.

i bought a new phone

explanation:

i will send you the money when i get back from lunch

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .