# PSY 340 Study Guide - Midterm Guide: Standard Deviation, Type I And Type Ii Errors, Central Limit Theorem

by OC2348700

Department

PsychologyCourse Code

PSY 340Professor

Alexandra IlieStudy Guide

MidtermThis

**preview**shows half of the first page. to view the full**3 pages of the document.**Study Guide Exam 2 Fall 2017

This is just a guide, read the assigned chapters. Also, review the problems that we

solved in class. Keep in mind that all statistics is partially-cumulative (i.e., you will

see concepts covered before in other chapters such as mean, standard deviation

etc.).

z-scores for individual scores (meaning, calculation for sample and population)

Transforming X values into z-scores

Converting z-scores to X values

Other relationships between z, X, µ, and σ:

• if the values for µ, X, and the z-score are given, what is the standard deviation

for the population (σ)?

• if the values for σ, X, and the z-score are given, what is the mean for the

population (µ)?

Finding proportions or probabilities for specific z-score values (identifying

proportions above/below z-scores using the unit-normal table).

Find the proportion located between 2 scores:

For example: p(65<X<75) = ?

Identifying probabilities and proportions for scores from a normal distribution:

• Example: It is known that IQ scores form a normal distribution with µ = 100

and σ = 15. Given this information, what is the probability of randomly

selecting an individual with an IQ score less than 120?

(this example is presented in the textbook, pp. 178-179)

Standardizing an entire distribution (impact on shape, mean, SD)

Comparing scores across different distributions (using z-scores to make

comparisons)

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