M1.Mod 5 In Class Review

 Does the scatter plot to the right show a positive or negative

association?  What does this mean in context of the situation?

The variables are​ (a)   associated. As ​ horsepower ​ (b)   , so does the weight of the car

• positively
• increases
• decreases
• negatively
• not

The scatterplot to the shows the relationship between 

            the height of a person (in inches) and the diameter of their

            eyeball (in mm).  Each data point represents a single person. 

 

What type of correlation, if any, does the scatter plot depict?

There is ​ (a)   correlation between a person's height and the diameter of the eyeball.

• no
• a positive
• a negative

Data is collected comparing temperature (in degrees) and ice cream sales (in dollars). 

 

The correlation coefficient is r = 0.9104.

What does this tell you about the strength of the correlation?

• It is weak

• It is strong

• It is moderately strong

• It is moderately weak

Data is collected comparing temperature (in degrees) and ice cream sales (in dollars).

The correlation coefficient is r = 0.9104.

What does this tell you about the direction of the correlation?

• It is positive

• It is negative

• There is no correlation so there is no direction

Data is collected comparing temperature (in degrees) and ice cream sales (in dollars).

The correlation coefficient is r = 0.9104.

Interpret the direction of the correlation in context of the problem.

As the temperature ​ (a)   , ice cream sales ​ (b)   .

• increases
• increase
• decreases
• drops

Data is collected comparing the number of Hot Cheetos eaten and the student’s grade in social

science (percent).

 

The correlation coefficient is r = -0.357.

 

What does this tell you about the strength of the correlation?

• The strength is weak

• The strength is strong

• There is no correlation

Data is collected comparing the number of Hot Cheetos eaten and the student’s grade in social

science (percent).

 

The correlation coefficient is r = -0.357.

 

What does this tell you about the direction of the correlation?

• It is negative

• There is no correlation

• It is positive

Data is collected comparing the number of Hot Cheetos eaten and the student’s grade in social

studies (percent).

 

The correlation coefficient is r = -0.357.

 

   Interpret the direction of the correlation in context of the problem.

• As more Hot Cheetos are eaten, the student's grade in social studies decreases.

• As less Hot Cheetos are eaten, the student's grade in social studies decreases.

• As more Hot Cheetos are eaten, the student's grade in social studies increases.

• There is no correlation between Hot Cheetos and the grade.

Sarah keeps a record of how many push ups she completes each day. She calculates a line of regression to predict how many push ups she will be able to do in the future. The regression equation is y = 4.4x + 42. What is the slope?

Sarah keeps a record of how many push ups she completes each day. She calculates a line of regression to predict how many push ups she will be able to do in the future. The regression equation is y = 4.4x + 42. Interpret the slope in the context of the problem.           

• For each additional 4.4 days, the number of push ups Sarah does is predicted to increase by 1.

• For each additional day, the number of push ups Sarah does is predicted to increase by 4.4.