What is the value of the expression?

To evaluate an algebraic expression means to find the value of the expression when the variable is replaced by a given number. To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.

What is the variable in an expression?

A variable is a symbol that stands in for an unknown value in a mathematical expression. A term is a single number, variable, or a number and a variable multiplied together. A variable expression is a combination of terms and mathematical operations that contains at least one variable.

What is the value of this expression when a 3 and b =- 2?

The answer is 1.

What type of variable is price?

Quantitative data is data where the values can change continuously, and you cannot count the number of different values. Examples include weight, price, profits, counts, etc. Basically, anything you can measure or count is quantitative.

What is the highest form of measurement?

Ordinal scales Ordinal

Are SAT scores nominal?

There is no absolute 0, as SAT scores are scaled. The ratio between two scores is also meaningless. A student who scored a 600 did not necessarily do twice as well as a student who scored a 300.

Is IQ ordinal?

In particular, IQ scores reflect an ordinal scale, in which all scores are meaningful for comparison only. There is no absolute zero, and a 10-point difference may carry different meanings at different points of the scale.

Is blood pressure nominal or ordinal?

Most physical measures, such as height, weight, systolic blood pressure, distance etc., are interval or ratio scales, so they fall into the general “continuous ” category.

What are ordinal questions?

Ordinal Scale Questions This question type asks respondents to rank a range of items or choose from an ordered set. This is helpful when you want to find out the importance level of each individual.

What is the value of the expression?

How many terms are in an expression?

A Term is either a single number or a variable, or numbers and variables multiplied together. So, now we can say things like “that expression has only two terms”, or “the second term is a constant”, or even “are you sure the coefficient is really 4?”

What is the definition variable?

A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variables.

How do variables work?

A variable is so named because it is capable of changing, as opposed to a numerical value, which must remain constant. Thus, it can vary in its actual value. This potential variability gives it the name variable. In contrast, the number 5 cannot change its value.

What are the main types of variables?

There are six common variable types:

DEPENDENT VARIABLES.
INDEPENDENT VARIABLES.
INTERVENING VARIABLES.
MODERATOR VARIABLES.
CONTROL VARIABLES.
EXTRANEOUS VARIABLES.

What are the two main types of variables?

Discrete and continuous variables are two types of quantitative variables:

Discrete variables represent counts (e.g. the number of objects in a collection).
Continuous variables represent measurable amounts (e.g. water volume or weight).

What are the 5 kinds of variables?

There are different types of variables and having their influence differently in a study viz. Independent & dependent variables, Active and attribute variables, Continuous, discrete and categorical variable, Extraneous variables and Demographic variables.

What are the four kinds of variables?

Four Types of Variables You can see there are four different types of measurement scales (nominal, ordinal, interval and ratio). Each of the four scales, respectively, typically provides more information about the variables being measured than those preceding it.

What are the uses of variables?

Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves. It is helpful to think of variables as containers that hold information.

Why is it important to classify data and variables?

A proper data classification allows your organization to apply appropriate controls based on that predetermined category data. Remember, your controls often come with a cost. You don’t necessarily need to have the same kinds of controls for all kinds of data.

What type of variable is year of birth?

Discrete variables can only be specific values (typically integers). For example: number of siblings. year of birth.

What type of variable is type of music?

discrete (categorical) variables can be further classified into: ➢ nominal variable: no natural ordering between categories (e.g., religious affiliation, mode of transportation, favorite type of music, …) (e.g., size of automobile, social class, political philosophy, patient condition, …)

Is nationality qualitative or quantitative?

Nominal data are used to label variables without any quantitative value. Common examples include male/female (albeit somewhat outdated), hair color, nationalities, names of people, and so on.

What type of variable is weight?

For example, because weight is a ratio variable, a weight of 4 grams is twice as heavy as a weight of 2 grams.

What type of variable is weight in kg?

So it is obvious that weight is a continuous variable as it can be quantified with decimal precision;like 10.2 kg and 3.0122 kg.

What type of variable is male or female?

Dichotomous variables

What type of variable is attitude?

A wonderful example of an ordinal variable are the teaching evaluations you do. (The following question measures “attitudes” and is very common. All of these kind of attitude variables are ordinal in scale.

What type of variable is speed?

Discrete variables are those that can take only a finite number of values. This is not so for speed of an airplane. as it changes from time to time. Hence, speed of an airplane is continuous.

What type of variable is yes or no?

A variable is said to be Binary or Dichotomous, when there are only two possible levels. These variables can usually be phrased in a “yes/no” question. Whether nor not someone is a smoker is an example of a binary variable.