Stats 301 benchmark

3, 3, 3, 3, 18, which measure would 18 in this dataset affect the most

mean

which situation would produce the largest standard deviation

scores range from 40 to 95, WIDER SPREAD IN DATA

the data in a skewed data set

goes towards one end of the x axis (not symmetrical)

when a dataset is symmetrical, which measures are equal?

mean, median, and mode

a scale that gives the wrong reading every time is

reliable but not valid

validity refers to _____ and reliability refers to _____

accuracy, consistency

the null hypothesis generally states

there is no effect

if p =.03 you should

reject the null

power is

the likelihood that a statistical test will detect a true effect and correctly reject a false null hypothesis

a coach wants to compare mile times before and after a training camp

paired t-test

a therapist wants to compare anxiety scores between two different majors uses

independent t-test

a camp director wants to know if there are differences in favorite activities (swimming, hiking, canoe) among campers

chi-square

a principal wants to compare GPA across the four class years (freshman, sophomore, juniors, seniors)

one-way ANOVA

a study examines the effect of caffeine intake on(none/low/high) and time of day (AM/PM) on average hours of sleep

factorial ANOVA

a study examines the effect of caffeine intake on(none/low/high) and time of day (AM/PM) on average hr of sleep, how many effects would there be?

2

a correlation of r = -0.8 indicates

strong negative

as sleep increases, stress decreases, this is an example of a

Negative Correlation

restriction of range typically makes corrections

smaller

an r-squared of .36 means

36% variance explained

a residual is

distance between a data

political party is an example of

categorical variable

happiness on a scale from 1-10 is an example of a

continuous variable

type of vairables used for t-tests and ANOVAs

IV = categorical, DV = continuous

type of variables used for correlations and regression

IV = continuous, DV = continuous

types of variables used for chi-square

IV=categorical, DV = Categorical

in a normal distribution where do we least expect to see data?

on the edges, far from the mean

for each of our tests, what did we compare to the obtained value with?

critical value

which hypothesis is treated as innocent until proven guilty

null hypothesis

a researcher is responsible to set the _____ for each their statical test

alpha level