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Week 3, percentile rank
portion of individuals in a distribution with…
Week 3
Chapter 8
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hypothesis testing
statistical method that uses sample data to evaluate a supposition about a population
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test statistic
indicates that the sample data are converted into a single figure to test a hypothesis
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critical region
group of extreme sample values very unlikely to be obtained if null hypothesis is true
alternative hypothesis
states that there is a change, a difference, or a relationship for the general population
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states that in the general population there is no change,
no difference, or no relationship
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directional hypothesis test
method wherein statistical suppositions specify either an increase or a decrease in the population mean
Cohen's d
measure of the distance between two means, typically reported as a positive number
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Chapter 6
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Independent Random Sample
data set obtained using selection process wherein the probability of being selected stays constant
independent random sampling
selection process wherein the probability of being selected stays constant from one selection to next
sampling with replacement
selection process that returns individuals to the population in order to keep probabilities from changing
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Simple random sample
data set obtained using selection process wherein each individual has equal chance of being selected
Random sampling
selection process wherein each individual in the population has an equal chance of being selected
unit normal table
list of proportions of the normal distribution for a full range of possible z-score values
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Chapter 7
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law of large numbers
rule that larger sample size increases probability that sample and population means will be close
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central limit theorem
mathematical proposition which serves as a cornerstone for much of inferential statistics
percentile rank
portion of individuals in a distribution with scores less than/equal to the specific score
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