kin 232 - mod 9 probability and hypothesis testing

inferential statsa

makes judgements of the probability that an observed difference between groups is statistically different or it was by chance

population distribution

the data from which sample is chosen

sample distribution

a small subset group of the population is measured

sampling distribution of means

measures an infinite number of samples with the number of people in each sample

true

the sampling distribution of means is a frequency distribution of all the infinitely possible sample means from a population

t or f

false

in a sample distribution there are more than one sample

t or f

true

the sampling distribution of means makes a normal distribution

t or f

false

the sampling distribution has the mean not equal to the population mean

t or f

true

the sampling distribution has a standard error that is a function of the sample SD and sample side

hypothesis testing

sample data is used to make inferences about the population and allows to determine if sample represents the population

\

true

in hypothesis testing, interval and ratio data uses the mean as the best way to represent it

t or f

false

as N increases (number of people), variability about the mean is increased

t or f

95%

what is the probability of having a sample mean between 38 and 42 kg if the mean is 40kg and SD is 1

what is the probability of having a sample mean below 38 kg and above 42 kg if the mean is 40kg and SD is 1

significance level

probability is used to define he sample means as being too unlikely to represent the underlying raw population/rare event

statistically different

anyone in the red area is considered ______________________

alpha =0.05 one tail

the least conservative z score has a what significance level and how many tails

alpha = 0.01 two tail

the most conservative z score has what significance level and how many tails

false

ideally a smaller z score is better

t or f

directional

a one tail test is used if there is a __________ word

non directional

a two tail test is used if there is a ___________ word

p < 0.01

if alpha = 0.01 and there was a statistical difference then p should be

p > 0.01

if alpha = 0.01 and there was no significant difference then p should be