This problem is about variables.
- a. What is a variable?
- b. Identify two main types of variables.
- c. Identify the two types of quantitative variables.
a.
To define: variables
Answer to Problem 1RP
Variables are the characteristics of the individuals of the population being studied, and it can vary one entity to another.
Explanation of Solution
Variables: A variable is the characteristic of the individuals of the population, which an investigator is interested to study.
A variable can vary one entity to another. It is an attribute to describe any characteristic of the individuals being studied.
b.
To identify: The two main types of variables
Answer to Problem 1RP
The two main types of variables is qualitative and quantitative
Explanation of Solution
Mainly one can classify a variable into two parts. One is qualitative variable and another is quantitative variable.
Qualitative data are non-numerical measures such as characteristics, attributes or labels whereas quantitative data are numerical measures on which arithmetic operations are possible.
Eye color is an example of qualitative variable and height is an example of quantitative variable
c.
To identify: The two types of quantitative variables
Answer to Problem 1RP
The two types of quantitative variables is discrete and continuous
Explanation of Solution
Two types of quantitative variables :
Discrete Variable: It is a quantitative variable. It consists either a finite number of possible values or countable number of possible values. Discrete variable can’t take every possible value between two possible values.
Continuous Variable: It is a quantitative variable. It consists an infinite number of possible values that are not countable. Continuous variable can take every possible value between any two possible values.
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Chapter 2 Solutions
Introductory Statistics (10th Edition)
- Cholesterol Cholesterol in human blood is necessary, but too much can lead to health problems. There are three main types of cholesterol: HDL (high-density lipoproteins), LDL (low-density lipoproteins), and VLDL (very low-density lipoproteins). HDL is considered “good” cholesterol; LDL and VLDL are considered “bad” cholesterol. A standard fasting cholesterol blood test measures total cholesterol, HDL cholesterol, and triglycerides. These numbers are used to estimate LDL and VLDL, which are difficult to measure directly. Your doctor recommends that your combined LDL/VLDL cholesterol level be less than 130 milligrams per deciliter, your HDL cholesterol level be at least 60 milligrams per deciliter, and your total cholesterol level be no more than 200 milligrams per deciliter. (a) Write a system of linear inequalities for the recommended cholesterol levels. Let x represent the HDL cholesterol level, and let y represent the combined LDL VLDL cholesterol level. (b) Graph the system of inequalities from part (a). Label any vertices of the solution region. (c) Is the following set of cholesterol levels within the recommendations? Explain. LDL/VLDL: 120 milligrams per deciliter HDL: 90 milligrams per deciliter Total: 210 milligrams per deciliter (d) Give an example of cholesterol levels in which the LDL/VLDL cholesterol level is too high but the HDL cholesterol level is acceptable. (e) Another recommendation is that the ratio of total cholesterol to HDL cholesterol be less than 4 (that is, less than 4 to 1). Identify a point in the solution region from part (b) that meets this recommendation, and explain why it meets the recommendation.arrow_forward1. Identify whether the variable in the information below is qualitative or quantitative. A nurse collects blood from kids and measure their blood-sugar content. This measure of blood-sugar concentration is a variable. a. quantitative b. qualitative c. qualitative as well as quantitative d. neither qualitative nor quantitative 2. Identify the technique for gathering data in the study below. A pharmaceutical firm wants test the effectiveness of a new drug. It wants to know if the new drug is significantly stronger than the conventional drug. This is a/an study. a. observational b. experimental c. census d. sampling 3. You want to plot a frequency graph of daily rainfall, with rainfalls (inches) on the horizontal axis. You will use a a. bar chart b. histogram c. cumulative frequency d. best fit line 4. Frequency of categorical data are displayed using a a. bar chart b. histogram c. time series graph d. best fit linearrow_forward1. What are the variables under study?2. From the information given, comment on the relationship between variablesarrow_forward
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