A researcher is interested in measuring the benefits of undergoing cosmetic surgery. He conducted an experiment where he measured depression (as measured by the BDI) among individuals who received plastic surgery and a control group that was on a wait list. Below are the results of a one-way ANOVA. Std. Error 95% Confidence Interval for Mean Upper Bound N Mean Std. Deviation Lower Bound Waiting List 145 25.10 15.914 1.322 22.48 27.71 Cosmetic Surgery 131 20.79 13.702 1.197 18.43 23.16 Total 276 23.05 15.033 .905 21.27 24.84 Test of Homogeneity of Variances Beck Depression Inventory Levene, Statistic df1 df2 Sig. 3.511 1 274 .062 ANOVA Beck Depression Inventory Sum of Squares df Mean Square Sig. Between Groups 1274.101 .017 60876.083 62150.185 Within Groups 274 Total a. Was the assumption of homogeneity of variance met? b. Calculate MS between с. Calculate MS within d. Calculate total degrees of freedom е. Calculate the F-ratio f. Was there a significant difference between groups? Do we reject or fail to reject the null hypothesis? The null hypothesis.

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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.