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Midterm

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

Department
Psychology
Course Code
PSY 340
Professor
Alexandra Ilie
Study Guide
Midterm

This 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)
find more resources at oneclass.com
find more resources at oneclass.com
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