introduction to probability homework answers

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Introduction to Probability and Statistics (15th) Edition 1337554421 9781337554428

Introduction to Probability and Statistics (15th Edition) Edit edition This problem has been solved: …

The given study is about blood pressure which is of two types-systolic and diastolic. A high blood pressure is considered fatal but low blood pressure is not very serious health issue. Since, blood pressure varies across gender and age, thus, blood pressure of any person should be reported relative to a population comprising people of same age and gender.

The data accompanying the study comprises blood pressure of 1910 persons, including 965 men and 945 women in the age group of 15-20 years.

The objective is to state the variables that are measured in the study along with the type of the variables.

Variables refer to characteristics (subject to change over time) of person or objects under study.

In the given context, find the following variables that are measured as stated below:

3. Systolic blood pressure and

4. Diastolic blood pressure.

Variables which measure the characteristic of each experimental unit are known as qualitative variable . In the given study, sex is the qualitative variable.

On the other hand, variables which measure the numerical amount on each experimental unit are known as quantitative variable . In the given context, age, systolic blood pressure and diastolic blood pressure are quantitative variables.

Discrete variable is one type of quantitative variable that takes only finite number of values. Thus, in the given context, age is the discrete variable.

Continuous variable is one type of quantitative variable that can take any number of values corresponding to points on the line interval. Thus, in the given context, systolic and diastolic blood pressure are two continuous variables.

A data is univariate one, if only a variable is measured on a single experimental unit. Similarly, call a data bivariate , if two variables are measured on a single experimental unit and multivariate data is the one, where more than two variables are measured on the experimental units.

Since, age, sex, systolic and diastolic blood pressure are measured on every experimental units, declare the data to be multivariate one.