Independent vs. Dependent Math

Brandon graphed the cost of his cell phone bill as he continued to use minutes. What is the independent variable for the given situation?

• minutes used per month

• cost in dollars

• cost per minute

• Brandon's cell phone

Maria is starting to babysit to earn extra money. She is charging $15 for each hour she babysits. What represents the independent variable?

• the total amount she charged for babysitting

• the rate she is paid per hour

• the number of hours she babysits

• the number of children she babysits

The total cost, t, for frozen yogurt depends on the weight, w, in ounces. If Freddy's frozen yogurt shop uses the equation t=0.34w+2 to determine the cost of frozen yogurt which represents the dependent variable in this situation?

• 0.34

• t

• 2

• w

Angelina set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.

• Distance traveled by the ball

• Height of the ramp

• Mass of the ball

• Who set up the experiment (Ms. S, etc)

The outcome of one event not affecting the outcome of another event is called a(n)

• dependent event

• independent event

• outcome

• compound event

You roll a 2 on a number cube and spin a 3 on a spinner. Is an example of __________ event?

• Independent

• Depenedent

Examples of independent events are (select all that apply):

• picking a marble from a bag of 6 marbles, not replacing it, and then picking a marble again

• tossing a coin three times

• picking a card from a deck, putting it in your pocket, and then picking another card

• rolling a dice then tossing a coin

You choose a King from a deck of cards and get heads in a coin toss. Is an example of __________ event?

• Independent

• Depenedent

You choose a class member for your study group, then choose an additional classmate. Is an example of __________ event?

• Independent

• Depenedent

Two cards are drawn from a standard deck of cards and no cards are returned to the deck. Identify whether the events are independent or dependent.

• Independent

• Dependent