Data and Statistics

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 type of association does this graph have?

• strong positive

• moderate negative

• weak positive

• none

What type of association does this graph show?

• Positive
• negative
• none
• all of the above

Which sentence describes the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase. 
• As the temperature increases, the number of visitors increases. 
• As the visitors increase, the temperature decreases. 
• No correlation

What does the value, r= -0.89, tell us about the linear relationship of two quantitative variables?

• Strong positive correlation

• Weak positive correlation

• Strong negative correlation

• Weak negative correlation

Estimate the correlation coefficient of the given data:

• .8320

• -.9643

• 1.409

• .4864

What is the shape of the data distribution?

• Skewed right

• Skewed left

• Symmetric

• Normal

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x - 170

• y = 25x + 170

• y = 5/8x - 170

Which scatter plot shows a linear relationship between x and y?

• Graph A

• Graph B

• Graph C

• Graph D

Which equations best fits the data?

• y = -5/3x + 375

• y = -1/3x + 475

• y = 5/3x + 3

• y = 1/3x + 375