Flashcards in T-Tests Deck (12)

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1

## Used to determine if your sample is different from a specified population; most commonly applied when the test statistic would follow a normal distribution

### T-test

2

##
t = X-μ/SE

df = N-1

###
One sample t test

X is the average

3

## The t-distribution is a ______ of ______, which are mound shaped and symmetrical like the standard ________ distribution. However, the t-distribution changes shape has a function of the *______ _______; the "tails" become thicker as ____ decreases

###
family of curves

normal

sample size

N

4

## The ___________ t-test is used when two separate sets of separate but identically distributed samples are obtained, one from each of the two populations being compared.

### independent (or two-sample)

5

##
True or False

This is an example of an independent t-test; suppose we are evaluating the effect of a medical treatment, and we enroll 100 subjects into our study, then randomly assign 50 subjects to the treatment group and 50 subjects to the control group.

### True

6

## Because the t-test has fatter tails, it will have greater _________, and requires a greater ________ in order to be significant

###
probability

difference

7

## This t-test can answer the question of how does a sample we take, compare with a known norm; for example; does our sample (dental class average age) compare to the known value of average national dental school age

### one-sample t-test

8

## ______ ______ (or _______) t-tests typically consist of a sample of matched pairs of similar units, or one group of units that has been tested twice (a "repeated measures" t-test); for example; a blood pressure measurement before and after something

### paired sample (or dependent)

9

## Assumptions/Requirements for the t-test; require the dependent value to be _________ (interval/ratio measurement scales), the samples are derived from ________ distributions, the samples are derived from populations with roughly equal ________, (will have equal STDs) the groups are ______ (samples not measured twice); can nominal or _______

###
continuous

normal

variances

independent

ordinal

10

## Use t-distribution when the sample size is _____

### small

11

## _______ analysis should ideally be done prior to data collection when estimating the sample size

### prospective

12