[Steps Shown] Testing for a Linear Correlation. In Exercises 13-28, construct a scatterplot, find the value of the linear correlation coefficient r and find
Question: Testing for a Linear Correlation. In Exercises \(13-28\), construct a scatterplot, find the value of the linear correlation coefficient \(r\) and find the critical values \(r_c\) from Table A-6 using \(\alpha=0.05\). 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 from Table 10-1 in the Chapter Problem are listed below. Is there a linear correlation between the CPI and the cost of a slice of pizza?
| CPI | Cost of Pizza |
| 30.2 | 0.15 |
| 48.3 | 0.35 |
| 112.3 | 1 |
| 162.2 | 1.25 |
| 191.9 | 1.75 |
| 197.8 | 2 |
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