Review questions for test 2 Flashcards
Two types of Criterion Validity?
Predictive and concurrent are two types of?
Of all the types, this type of validity is the only one that has subcategories?
Criterion validity is the only type to have?
Can a tool be reliable without being valid?
Yes
Can a tool be valid without being reliable
no
Measures what you’re looking for is defined as sensitive or specific?
sensitive
quota sampling is similar to random sampling except?
in quota sampling you don’t RANDOMLY select, you CONVENIENTLY select
difference between population and sample
population is the whole group and the sample is the part of the group that represents the population
difference between sampling bias and sampling error
sampling error results from the sampling bias
types of probability sampling
stratified, simple, cluster, systematic
two groups in a study, what’s the minimum number you need in each group
30
Assurance that you are correct in rejecting the null hypothesis is called?
statistical power
three elements in determining the most appropriate sample size
alpha, effect size, desired power level
What is a sampling plan
How you’re going to collect your people, your inclusion and exclusion criteria
what conditions must be met to use probability sampling
list of people, number them, random sampling
difference between simple random sampling and convenience sampling
Convenience sampling is getting people who are conveniently there, who are willing to participate. Random has a wider scope, and since it’s random, there’s less chance of bias
Choice between simple random sampling and convenience sampling, which one should you go with?
Simple, because it’s unbiased
Rule of thumb for sample size?
30 per group
With statistical power, the greater the power the more…?
The more applicable the results
Name 5 pieces of information require for informed consent
Risk and benefits, alternative treatments (if there are any), what they’re agreeing to do, the purpose of the study, consent
name 3 vulnerable groups
kids, elderly, pregnant
difference between highest and lowest number
range
greek symbols always mean we’re talking about population….?
Population parameters
If P is less than Alpha….?
Reject the null hypothesis
what does the null hypothesis say?
there is no releationship
If p is less than alpha, and you reject the null hypothesis…then?
There is a relationship, therefore the treatment that was given had an impact
wide confidence interval = _____ confidence
less confidence
narrow confidence interval= ______confidence
more confidence
test comparing two groups, looking for differences in means
t-test
Looking for differences in means between more than two groups
ANOVA
Found in RCTs an other studies that focus on treatment outcomes or illness predictions
Biostatistics
The degree of the difference or lack of difference between the groups in the study
magnitude of effect
