Background for t
t basics
t specifics
More About t
Heavy Hitting t
100
estimates population mean.
What is sample mean?
100
Used in place of real standard error when real value of standard error is unknown.
What is estimated standard error
100
flatter and fatter
What is t-distribution compared to bell curve
100
state null, alternate, pick alpha level
What is first step in hypothesis testing
100
measure of effect size
What is Cohen's D
200
expected difference between mean and mu
What is the standard error?
200
denominator in estimated standard error formula
What is the square root of n
200
used in place of unit normal table
What is table of values of t
200
make a decision
What is final step in hypothesis testing?
200
variability explained
What is r squared
300
t-statistic
What requires less information than a z-score?
300
estimated standard error
What is denominator for t statistic
300
scores in the tails
What is region of rejection?
300
estimates mu from the sample mean
What is confidence interval
400
requires information about the population standard deviation
What is a z-score
400
degrees of freedom for t
What is n of cases minus 1
400
determines which t-distribution is used
What is df
400
population samples is normal
What is an assumption of t statistic
400
For any α we know that (1 – α ) proportion of t values fall between ± t for the appropriate df;
What is basis of confidence interval
500
type of data researchers usually have
What is a sample
500
curves that vary with df
What are the distributions for t
500
zero
What is t when the null is true.
500
values in sample are independent
What is assumption of t-statistic
500
predicts direction of change or difference
What is a directional test
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