AP Stats Unit

What percent of the AP exam will involve content from Unit 1?

• 10-20%

• 12-15%

• 15-23%

• 2-5%

When choosing between different models to describe a relationship between two quantitative variables (select all that apply):

• If there is more than one model with a randomly scattered residual plot, choose the model with the largest coefficient of determination, r².

• use the standard deviation of the residuals to help choose a model, as the y values for the different models might be on different scales

• Choose the model whose residual plot has the most random scatter.

A box contains 3 brand A batteries and 7 brand B batteries. 30% of brand A batteries are faulty and 40% of brand B batteries are faulty. A battery is selected at random and then checked to see if it is faulty. What is the probability that a faulty brand B battery is selected?

• 0.28

• 1/4

• 0.42

• 0.21

Two dice are rolled and it is recorded whether the result on each is odd or even. What is the probability both are odd?

• 1/4

• 1/2

• 2/4

• 3/4

Given that a non-faulty battery is chosen, what is the probability that the battery is Brand A? Info needed: Brand A has 3 batteries in a pack of 10, and Brand B are the remaining in the pack. 30% of Brand A batteries are faulty while 40% of Brand B batteries are faulty.

• 0.21

• 0.33

• 0.63

• 0..42

What is the probability that a student does play a sport given they do not play an instrument? 

• .2

• .2222

• .10

• .5

What is the probability that a female is chose given they like a Toyota? 

• .525

• .4627

• .6774

• .3143

Determine if the events are independent or dependent.

• Independent

• Dependent

• Yes, they are independent

• No, they are not independent

Is the number of cheeseburgers a fast-food restaurant serves each day discrete or continuous?

• Discrete

• Continuous