Chapter 3, Problem 36E

To determine

To Explain: the description of the association between hepatitis C and tattooing with appropriate graphical display.

Explanation of Solution

Given:

	Tattoo done in commercial parlor	Tattoo done elsewhere	No tattoo
Has hepatitis C	17	8	18
No hepatitis C	35	53	495

Calculation:

Percentage of people that have hepatitis C for whom tattoo done in parlour

  $\begin{array}{l}=\frac{\text{no}\text{.}\text{of}\text{people that have hepatitis C for whom tattoo done in parlor}}{\text{Total number people that have hepatitis C}}\\ =\frac{17}{43}\times 100\\ =39.5\%\end{array}$

Similarly, find the conditional distributions for the status of hepatitis C:

	Tattoo done in commercial parlor	Tattoo done elsewhere	No tattoo	Total
Has hepatitis C	39.50%	18.60%	41.90%	100%
No hepatitis C	6%	9.10%	84.90%	100%

Graph:

  

There is having tattoo increase the risk of hepatitis C. There are 39.5 percent peoples with tattoo have hepatitis C where only 6 percent of people without tattoo is having hepatitis C. Therefore using tattoo increases the danger of hepatitis C.