## Statistical Reasoning In Psychology

Statistical Reasoning In Psychology

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**For Week 2**, we will interpret the measures of central tendency, variance, sum of squares, and standard deviation, apply properties of the standard normal distribution, describe different methods of sampling, convert raw scores to Z scores, and compute a simple probability.

**Due Thursday **

Respond to the following in a minimum of 175 words:

**Chapter 2**

Define the following:

**(a.)** Mean

**(b.)** Mode

**(c.) **Median

**(d.)** Variance

**(e.)** Sum of squares

**(f.)** Standard deviation

**(g.) **Computational formula

**(h.)** Definitional formula

**(i.)** Outlier

**Chapter 3**

Define the following:

**(a.)** Probability

**(b.)** Normal distribution

**(c.)** Raw score

**(d.)** Z score

**(e.)** Population

**(f.)** Sample

**(g.)** Random selection

**(h.) **Random sampling

**(i.)** Population mean and what is the symbol for the population mean?

**(j.)** Sample mean and what is the symbol for the sample mean?

Compare and contrast the three different measures of central tendency. Provide an example of the most appropriate time to use each measurement scale.

(**Hint!** – Remember to cite and reference your response according to the APA writing style)

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.

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