lving: 1. The mean scores and the standard deviations of two independent random samples of kindergarten children on a social perceptiveness measure are as follows: Group 1: x1 = 21.3, Group 2: x2 = 18.1 S, = 5.8 S2 = 7.5 Assuming that the populations from which the samples have been drawn are normally n; = 20 n2 = 15 distributed and that the variances of the populations are equal, test if the difference between the two population means is significant at the .05 level. 2. The following data are the scores of the students in an examination. Male 4 16 11 8 Female 2 6 7 Test the significance of the difference of the means between the two samples using a = 10%. 3. A random sample of Grade 7 students were rated by their teacher on degree of responsibility based on a scale of 30 points at the start of the school year. The same students were rated by the same teacher at the end of the school year, Start 25 22 20 21 20 15 17 22 29 16 19 18 End 26 23 23 22 22 20 19 20 28 18 21 26

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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.