Scatter plot and correlation:
Construct a scatter plot, Find the value of the linear correlation coefficient r, and find the critical value of r using α=0.05. Determine whether there is sufficient evidence to support a claim of a linear correlation between the two variables.
CPI and Pizza the paired values of the consumer price index (CPI) and the cost of a slice of pizza are listed below: Is there a linear correlation between the CPI and the cost of a slice of pizza?
30.2 48.3 112.3 162.2 191.9 197.8
0.15 0.35 1.00 1.25 1.75 2.00
|
CPI
|
30.2
|
48.3
|
112.3
|
162.2
|
191.9
|
197.8
|
|
Cost of Pizza
|
0.15
|
0.35
|
1.00
|
1.25
|
1.75
|
2.00
|