Sensitivity & Specificity; PPV & NPV
The probability the patient will have a negative screen (no disease)
Probability of a true Negative
what is Specificity?
An assumption not required to use the chi-square test?
What is normal distribution.
Why does a researcher use an independent t-test?
What is to compare the means between 2 independent groups?
An NP wants to determine how often screening test results agree with the actual disease status of the patient, in order to make this calculation they do what?
What is efficiency of the screen?
Determines the statistically significance.
What is alpha?
The probability of a true positive if the patient has the disease.
What is sensitivity?
Name the types of variables required to perform a Chi-square test?
what is categorical variables - two.
What test does a researcher use when a pretest and posttest data come from the same person?
What is paired t-test?
What is the amount of illness present in the population divided by the entire population?
What is prevelence?
A researcher wants to use scales that are continuous to measure variables. What would you use for the measurement?
What is interval and ratio?
Researchers asked patients if they developed AF post-surgery (0=No, 1=Yes). What is the level of measurement of the dependent variable?
What is nominal?
In a study there is it was determined there is not association between the two variables. You know this means?
what is the p-value was greater than the alpha?
You randomly select 10 hospitals and outpaitent centers throughout the state and survey 2,400 nurses that work there. The 2,400 nurses are an example of
What is sample?
Reading a study that examines the relationship in women between being
over age 55 and colon cancer. The dependent variable is
What is colon cancer?
What is the average distance that the variables in a distribution are from the center.
What is standard deviation?
Formula to calculate the specificity of a screen.
What is true negatives (D)/all those who do not have the disease (A&B)?
page 58
Study results were Chi-Square 6.71; p<0.01 this means?
What is a significant association between the variables?
categorical variables are measured at nominal or ordinal level.
True or false
What is false?
The null hypothesis means what?
What is "that no relationship, association or difference exist between the two variables of interest?
An indicator of the center of the data
What is central tendency?
If a 4X4 table for association between a disease (present or absent) and screening test results (positive or negative), what describes a true positive?
What is test accurately identifies the presence of a disease?
What level of measurement is the dependent variable in a Chi-square test?
What is nominal?
If chi-square test result has a p-value that is significant (less than the 0.05 alpha, you are using) then you _____ the null hypothesis.
What is reject?
Chi-Square is used to test for a statistically difference or relationship when you have a _____ or ______ level dependent or outcome variable.
What is nominal or ordinal?
What is Leven's test?
What is a method that test a null hypothesis that the variance in two groups being compared are not different?
page 128 and 133