PSYC 1010 Study Guide - Midterm Guide: Statistical Power, Decision Rule, Null Hypothesis
31 May 2018
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PSYC 1010 EXAM 2
CHAPTER 5
• Z scores
o How far soeoe’s sore is fro the ea
▪ Measured in standard deviation lengths
• Positive=above mean
• Negative=below mean
• Types of questions
o Raw score to z score
o Z score to raw score
o Scaling question
▪ Raw score to z score
• Use original mean and standard deviation
• Plug in x
• Isolate for z
▪ Z score to raw score
• Use new mean and standard deviation
• Plug in z
• Isolate for x
CHAPTER 6
• Probability
o Different senses of the word probability
o Relative frequency view: classic probability
• Relationship between probability and statistics
o Probability bridge
o Probability and frequency distributions
▪ Relative frequency (frequency percent) is probability
o Probability and the normal distribution
▪ Mean=median=mode
▪ Symmetrical
o 3 stages
▪ 1
• using the probability bridge and the normal distribution to predict
the probability of a specific individual score
o classic probability
▪ 2
• using the probability bridge and the normal distribution to predict
the probability of a specific sample mean
o classic probability
o two ideas added
▪ sampling distribution of the mean
▪ central limit theorem
find more resources at oneclass.com
find more resources at oneclass.com
▪ 3
• inferential statistics- taking the probability bridge backwards
o involves hypothesis testing
▪ using probability to determine which of 2
hypotheses about the population you are going to
choose as being correct
• null hypothesis
• alternative hypothesis
• probability and predicting individual scores
o stage 1 of the big picture
o what you need to answer this kind of question
▪ starting point
▪ ending point
▪ path
• use the z formula to get raw scores or vice versa
• use the normal distribution to get probabilities from z scores or
vice versa
• things to notice about the z table
o only lists positive z scores
o info in columns can be listed as percentage or proportion of 1
o diagrams
▪ mean to z
▪ tail
▪ body
• hints
o draw a map
o draw the normal distribution out and shade in the area you are looking for
CHAPTER 7
• probability and predicting sample means
o stage 2 of the big picture
▪ classic probability
▪ two ideas added
• sampling distribution of the mean
• central limit theorem
• sampling distribution of the mean
o definition
▪ creating sampling distribution of the mean
o characteristics of the sampling distribution of the mean
▪ mean of the sampling distribution of the mean
▪ standard deviation of the sampling distribution of the mean
▪ shape of the frequency distribution that is the sampling distribution of
the mean
find more resources at oneclass.com
find more resources at oneclass.com
