Correlation Test 13. Random students are selected from a history class and asked the number of hours they studied for a recent test. The hours, and the resulting score on the test, are as follows: Hours 2 5 13 9. 4 2 8 4 7 Score 81 83 94 96 62 57 71 76 59 85 Can we say that there is a significant positive correlation among the data? (a = .05) 14. An NPR report claims that lower GPA's are associated with students who watch a higher number of hours of television. You sample 10 students, and get the following data: GPA 3.1 2.4 2.0 3.8 2.2 3.4 2.9 3.2 3.7 3.5 Hrs. TV 14 10 20 7 25 9. 15 13 4 21 Can we say that there is a significant negative correlation among the data? (a = .10)

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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.