Topic 5 DQ 1 Linear correlation

Topic 5 DQ 1 Linear correlation

Linear correlation refers to a straight-line relationship between two variables. Linear correlation analysis can determine if there is a relationship between variables, either a positive or a negative correlation.  A positive correlation means that as one variable increases or decreases the other variable increases or decreases whereas a negative correlation is when one variable increases the other decreases. In the example provided, it would be considered a positive correlation because cigarette smoking increases pulse rate. Correlation does not necessarily prove causation. Causality is a way to know if one event causes another (Grove, Gray, and Burns, 2015).  In order to test for correlation you can conduct a t-test if between 2 variables or a chi test, ANOVA, or ANCOVA for three or more variables. The conclusion indicates that cigarette smoking causes the pulse rate to increase but performing a test as mentioned above would allow for the conclusion to be stated as other variables such as age, amount of cigarettes, coronary artery disease can all be variables that increase pulse rate.

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You must proofread your paper. But do not strictly rely on your computer’s spell-checker and grammar-checker; failure to do so indicates a lack of effort on your part and you can expect your grade to suffer accordingly. Papers with numerous misspelled words and grammatical mistakes will be penalized. Read over your paper – in silence and then aloud – before handing it in and make corrections as necessary. Often it is advantageous to have a friend proofread your paper for obvious errors. Handwritten corrections are preferable to uncorrected mistakes.

Use a standard 10 to 12 point (10 to 12 characters per inch) typeface. Smaller or compressed type and papers with small margins or single-spacing are hard to read. It is better to let your essay run over the recommended number of pages than to try to compress it into fewer pages.

Likewise, large type, large margins, large indentations, triple-spacing, increased leading (space between lines), increased kerning (space between letters), and any other such attempts at “padding” to increase the length of a paper are unacceptable, wasteful of trees, and will not fool your professor.

The paper must be neatly formatted, double-spaced with a one-inch margin on the top, bottom, and sides of each page. When submitting hard copy, be sure to use white paper and print out using dark ink. If it is hard to read your essay, it will also be hard to follow your argument.