A scientist takes 40 water samples of the Atlantic ocean in various locations and 40 water samples of the Pacific ocean in various locations. Of the Atlantic samples, there is an average salt concentration of 36 parts-per-thousand (ppt) with a standard deviation of 1 ppt. Of the Pacific samples, the average salt concentration was 34 ppt with a standard deviation of 2 ppt. Is there evidence to suggest a difference in saltiness between the two oceans? Use a 10% significance level. 1. We are comparing two groups, and so it's either going to be a proportion or mean. Are we comparing proportions across two samples or means across two samples? 2. What is the sample size of each sample? Let's call these n1 and n2. 3. What was the average ppt of each sample? Let's call these ¤1 and x2.
Percentage
A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.
Algebraic Expressions
In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.
Numbers
Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.
Subtraction
Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.
Addition
Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.
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