Acceleration

Acceleration is defined as the rate of change of velocity. The units of measurements for acceleration can be implied from the definition to be meters/second divided by seconds, usually written $$m/s^2$$. Acceleration is inherently a vector quantity, and an object will have non-zero acceleration if its speed and/or direction is changing. Average acceleration The average acceleration is given by: … Leggi tuttoAcceleration

Descriptive statistics

Descriptive statistics is the branch of statistics that involves organizing, displaying, and describing data.

Fraction

A fraction is a real number written as a quotient, or ratio, of two integers $$a$$ and $$b$$, where $$b\neq 0$$. $\dfrac{a}{b}$ The integer above the fraction bar $$a$$ is called the numerator and the integer below $$b$$ is called the denominator. The numerator is often called the “part” and the denominator is often called the “whole”. Equivalent fractions are two equal ratios expressed … Leggi tuttoFraction

Decimals

A decimal numeral, or just decimal, or, improperly decimal number, refers generally to the notation of a number in the decimal system, which contains a decimal separator: for example 3.14; the decimal separator is the dot “.” in many countries, but may be a comma “,” in other countries (mainly in Europe). The numbers that may be represented in the decimal system … Leggi tuttoDecimals

Natural (or counting) numbers

The set of natural (or counting) numbers, denoted with $$\mathbb{N}$$, is: $\{1,2,3,4,5,6,7,…\}$ The three periods (…) is called an ellipsis and indicates that the numbers continue without bound.

Chi-squared test

The chi-squared test, also written as $$\chi^2$$ test, is used to determine whether there is a significant difference between the expected frequencies and the observed frequencies in one or more categories.Without other qualification, ‘chi-squared test’ often is used as short for Pearson’s chi-squared test. Chi squared test can be used for different purposes, for example: testing … Leggi tuttoChi-squared test