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49 Cards in this Set
 Front
 Back
What is the standard deviation of a sampling distribution of a statistic?

Standard error


What is the standard deviation?

The square root of the variance


When would you use the t test instead of the zscore?

When scores are transformed using the population standard error of the mean to estimate the standard error of the mean


Conducting more ttests...

...decreases the reliability of the data


When would you use a chisquare test?

When you have a set of expected frequencies and you need to figure out how consistent the observed frequencies are with the null hypothesis


Twofactor ANOVA is used when...

...groups simultaneously belong to more than one classification


Total df for ANOVA

N1


Within df for ANOVA

Np


Between df for ANOVA

p1


What does p equal?

The number of groups


df for Factor 1 in 2 factor ANOVA

(# of factor 1 levels)1


df for interaction 1x2 in 2 factor ANOVA

(df1)(df2)


MSb

SSb/dfb


MSw

SSw/dfw


What is the F ratio represented by?

MSb/MSw


What does the F ratio help you find?

The probability that 2 variance estimates differ from each other only by sampling error


If there is no treatment effect, what does F equal?

1


A main effect is...

...a difference among population means for levels of a factor, ignoring the other factors


An interaction is...

...when the effect on one factor is not the same as the effect on all levels of another factor


Level =

df + 1


Number of groups =

(# of A levels)(# of B levels)


Within group variability=

Within group sum of squares


Total amount of between group variability =

SStotalSSwithin


Degrees of freedom for Pearson =

N2


r2 represents...

...the percent of variance explained by knowing the extent of the treatment


Spearman RankOrder Correlation (rs)...

...tests relationship between rankings of raters


For a 95% confidence interval, the zscore is

1.96


Permutations are ________, and combinations are ________.

ordered, not


Is an ANOVA test directional or nondirectional?

Nondirectional


In ANOVA, what is the null hypothesis?

The population means are equal to each other and to the grand mean


What is the alternative hypothesis in ANOVA

Not Ho


Total variability =

Between groups source + Within groups source


xij

i participant in j group


Tj

total of scores in group j


n1

number of participants in 1st group


What is a mean square similar to?

variance


How is a mean square found?

By dividing SS by its df


MSbetween reflects...

treatment effects + error


MSwithin reflects...

error


Ratio scale examples

Kelvin, height, weight


Interval scale examples

Fahrenheit/Celcius


Ordinal scale examples

Rankings


Nominal scale examples

Make of car


Ratio scales

Magnitude, equal intervals, absolute zero


Interval scales

Magnitude, equal intervals


Ordinal scales

Magnitude


Which measure of central tendency is sensitive to extreme values?

Mean


Range =

Largest score  Smallest score


A percentile rank is a _______, while a percentile point is a _______.

percentage, score
