Q. 4.110 - Elementary Statistics

Question

The data for shell thickness and concentration of PCBs for $60$ Anacapa pelican eggs from Exercise$4.76$ are on the Weiss Stats site.

(a) Decide whether finding a regression line for the data is reasonable. If so, then also do puts $\left(b\right)-\left(d\right)$.

Step-by-Step Solution

Answer

The regression line for the data is not-reasonable.

The graph will be

Step 1: Given Information

Whether it is reasonable to find the regression line or not.

Step 2: Explanation

The scatterplot for the given data can be drawn by using the MINITAB:

Step 1: Choose Graph $>$scatterplot

Step 2: Choose With Connect Line, and then click OK.

Step 3: Under $Y$ variables, enter a column of THICKNESS

Step 4: Under $Y$ variables, enter a column of PCB

Step 5: Click OK.

Step 3: Graphical representation

The scatterplot obtained will be,

From the above scatterplot, it is not reasonable to find a regression line for the data because the observations are not scattered around a line. Hence, there is no linear pattern visible in the given data. Therefore, the parts (b) - (d) will be omitted.