AP Stats Unit 2 Review

Which of the following is the best approximation of the rvalue for the above graph? 

• –1.0

• 0.0 

• 0.5 

• 0.9 

The test results of 66 students were compared to whether the students completed a provided review sheet.

Is there an association between completing the review sheet and passing the test?

• Yes, it was more likely that students who failed, completed the review sheet

• Yes, it was more likely that students who passed, completed the review sheet

• No, there is no association

Which graph shows a line of best fit for the scatter plot?

• Graph A

• Graph B

• Graph C

• Graph D

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

• A

• B

• C

• D

• E

Is this a probability distribution?

• No

• Yes

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

Estimate the correlation coefficient.

• r is close to 1

• r is close to -1

• r is close to 0

• r is close to -0.5

• r is close to 0.5

Which of the following best describes the above scatterplot?
I. There is a strong negative correlation.
II. There is a weak positive correlation.
III. The coefficient of determination will be positive. 

• I only 

• III only
  

• II and III only
  

• I and III only 

When the points of a scatterplot are arranged so that they are in an arc, what can we say about the correlation between x and y?

• There is a weak correlation between x and y. 

• There is a very strong correlation between x and y. 

• There is a nonlinear correlation between x and y. 

• There is a positive relationship between x andy.