Vocab Quiz 4: Statistics

Which variable represents the correlation coefficient?

• a

• b

• c

• r

the correlation coefficient measures ...

• the mean

• the median

• the third quartile

• the relationship between x and y

Which of these correlation coefficients represents a strong, positive relationship?

• r = 0.1

• r = - 0.9

• r = 0.566

• r = 0.87

If the correlation coefficient is close to 0, the relationship is

• weak or barely exists

• strong

If the correlation coefficient is close to 1 or -1, the relationship between x and y is

• weak or barely exists

• strong

Which of these scatter plots has a correlation coefficient of r = -0.9 ?

• 
• 
• 

Which buttons would you press on the graphing calculator to find the correlation coefficient of this data?

• Alpha, XTON

• y=, Graph

• Stat, edit, Stat, LinReg

• Stat, edit, Stat, 1VarStats

When you press Stat > Calc, 4:LinReg(ax+b), it helps you find the correlation coefficient AND ...

• the linear regression equation

• the quadratic formula

• mean

• median

There is a really strong correlation between ice cream sales and the number of shark attacks every summer. Does this mean that there is a causal relationship between ice cream sales and shark attacks?

• YES

• NO

Which variables have a causal relationship?

• number of copies printed and amount of ink left in printer

• number of siblings you have and your math grade