Chapter 7, Problem 7.41TY

a.

To determine

To find: The percent of all 8,474 people with normal blood pressure had CHD.

Answer to Problem 7.41TY

The percent of all 8,474 people with normal blood pressure had CHD is 0.0224 or 2.24%.

Explanation of Solution

Given info:

The data set consists of 8,474 who had normal blood pressure categorized into low anger, moderate anger and high anger with CHD (coronary heart disease) and No CHD.

Calculation:

The percentage of 8,474 people with normal blood pressure had CHD is given below:-

$\begin{array}{c}\text{Percentage}=\left(\frac{\text{Number}\text{of}\text{people}\text{with}\text{normal}\text{blood}\text{pressure}\text{and}\text{CED}}{\text{Total}\text{number}\text{of}\text{people}}\right)\times 100\\ =\frac{190}{8,474}\times 100\\ =0.0224\times 100\\ =2.24\%\end{array}$

Thus, the percent of all 8,474 people with normal blood pressure had CHD is 0.0224 or 2.24%.

b.

To determine

To find: The percent of all 8,474 people classified as having high anger.

Answer to Problem 7.41TY

The percentage of all 8,474 people with high anger is 0.0747 or 7.47%.

Explanation of Solution

Calculation:

The percentage of all 8,474 people with high anger is shown below:-

$\begin{array}{c}\text{Percentage}=\left(\frac{\text{Number}\text{of}\text{people}\text{with}\text{normal}\text{blood}\text{pressure}\text{had}\text{high}\text{anger}}{\text{Total}\text{number}\text{of}\text{people}}\right)\times 100\\ =\frac{633}{8,474}\times 100\\ =0.0747\times 100\\ =7.47\%\end{array}$

Thus, the percentage of all 8,474 people with high anger is 0.0747 or 7.47%.

c.

To determine

To find: The percent of people classified as having high anger had CHD.

Answer to Problem 7.41TY

The percent of people having high anger with CHD is 0.04265 or 4.27%.

Explanation of Solution

Calculation:

The percent of people having high anger with CHD is given below:-

$\begin{array}{c}\text{Percentage}=\left(\frac{\text{Number}\text{of}\text{people}\text{having high anger}\text{with}\text{CED}}{\text{Total}\text{number}\text{of}\text{people}\text{having high anger}}\right)\times 100\\ =\frac{27}{633}\times 100\\ =0.04265\times 100\\ =4.27\%\end{array}$

Thus, the percent of people having high anger with CHD is 0.04265 or 4.27%.

d.

To determine

To find: The percent of those with no CHD were classified as having moderate anger.

Answer to Problem 7.41TY

The percent of people having moderate anger with no CHD is 0.5578 or 55.78%.

Explanation of Solution

Calculation:

The percent of people having moderate anger with no CHD is mentioned below:-

$\begin{array}{c}\text{Percentage}=\left(\frac{\text{Number}\text{of}\text{people}\text{having moderate anger}\text{with}\text{no}\text{CHD}}{\text{Total}\text{number}\text{of}\text{people}\text{with}\text{no}\text{CHD}}\right)\times 100\\ =\frac{4,621}{8,284}\times 100\\ =0.5578\times 100\\ =55.78\%\end{array}$

Thus, the percent of people having moderate anger with no CHD is 0.5578 or 55.78%.

e.

To determine

To explain: Whether the data provides any evidence that as anger score increases the percent of who suffers then CHD increases or not.

Answer to Problem 7.41TY

Yes, as there is an increase in high anger people, the percent of people suffering from CHD also increases.

Explanation of Solution

Calculation:

From part (c), the percent of people having high anger with CHD is 4.27%.

The people having moderate anger with CHD percentage is given below:-

$\begin{array}{c}\text{Percentage}=\left(\frac{\text{Number}\text{of}\text{people}\text{having moderate anger}\text{with}\text{CED}}{\text{Total}\text{number}\text{of}\text{people}\text{having moderate anger}}\right)\times 100\\ =\frac{110}{4,731}\times 100\\ =0.02325\times 100\\ =2.33\%\end{array}$

Thus, the percent of people having moderate anger with CHD is 2.33%.

The people having low anger with CHD percentage is shown below:-

$\begin{array}{c}\text{Percentage}=\left(\frac{\text{Number}\text{of}\text{people}\text{having low anger}\text{with}\text{CED}}{\text{Total}\text{number}\text{of}\text{people}\text{having low anger}}\right)\times 100\\ =\frac{53}{3,110}\times 100\\ =0.0170\times 100\\ =1.70\%\end{array}$

Thus, the percent of people having low anger with CHD is 1.70%.

From the results it is observed that as the people with high anger increases the percentage of people suffering from CHD also increases.