PBSI 301 final exam

What is the foundation of inferential statistics?

probability

The fact that the tails of a normal distribution never touch the horizontal axis relates to the following property:

asymptotic

what is the sampling distribution in statistics

The distribution of a statistic (e.g., mean or variance) calculated from multiple random samples taken from a population.

what is the standard error in statsitics

a measure of variability due to random sampling

the null hypothesis refers to

the population

the term associated with identifying differences between groups that is not due to chance

signficance

the level of risk that you are willing to take that the results you find are not due to treatment is expressed by

the signficance level.

when you reject the null hypothesis and it is actually true

type 1 error

when you accept the null and its wrong

type 2 error

if the obtained value is greater than the critical value

you reject the null hypothesis, not statistically signficant

the term used to describe the ability of a statistical test to detect and reject a null hypothesis when it is false

power

the one sample z-test us used to compare the _____ to the_______

mean of a sample to the mean of a population

the null hypothesis for a one sample z-test would be

x bar = u

the shape of the distribution varies depending on the degrees of freedom

true

which of the following is a characteristic in the between-subject design

each participant is randomly assigned to one of the conditions of the study

which of the following is a major assumption of the student t-test regarding the amount of variability in each group

variance/SD are equal

null hypothesis in independent samples t-test

H: u1 = u2

the t-test for independent samples assumes which of the following

score are independent

effect size for independent samples t-test is

cohens D

difference between students t-test and welch's t-test

student's t-test assumes equal variances, while welch's does not

what statistical technique is used to examine one group of subjects under two different conditions.

paired-samples t-test

which statistical tests typically assess the normality assumption of a dataset

qq plot, shapiro wilk test