Statistics Two Variable

What does the ordered pair (5, 75) represent?

• 5 on the math test and 75 on the sleep score

• a 5th grader scored 75% on the math test

• 5 on the sleep score and 75% on the math test

• of the 5 students surveyed, they all scored a 75% on their math test

Describe the relationship between the ESS Score and the Math Test Score that you observe from the data shown.

• Positive correlation, as the ess score increases their math test scores increase

• Negative Correlation, as the ESS score increases their math test score decreases

• No Correlation, there is no correlation between the ESS score and their math test score

• Scatterplots cannot show a correlation they are just random plots on a graph

What is a line of best fit used for?

• To make predictions
• To make the graph look pretty
• To connect the points
• To make it look like you know what you are doing

What is the type of association?

• Negative 
• No correlation
• Positive 

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line to predict how many pages would be in a book with 19 chapters.

• 150 pages

• 120 pages

• 190 pages

• 210 pages

Write an equation in slope - intercept form for trend line.

• y = 1x+1/2
• y = 1/2x + 1
• y = 1x + 1
• y = 1/2x + 2

Using the LSRL, f(x) = 1.82x + 5.02, determine the predicted y when x=2.

• f(2) = 8.66

• f(2) = 6.84

• f(2) = -8.66

• f(x)= 3.64

Use the trend in the data to determine the correlation coefficient.

• r = 0.93

• r = -0.93

• r = 0.17

• r = -0.17

The correlation coefficient "r" is a value between

• 0 and 1
• 0 and 100
• -1 and 1
• -2 and 2

A perfect positive correlation has a correlation coefficient of ____. 

• 1
• -1
• 0