Research exam 3

Question 1

lead time bias

Answer 1

bias resulting from a disease and is found through screening
-can increase survival time and make treatment more effective

Question 2

lenght bias

Answer 2

is bias due to speed of progression of the disease

Question 3

detection bias

Answer 3

increase diagnosis or prevalence of the disease because of screening

Question 4

volunteer bias

Answer 4

volunteer tend to have better effect than those who dont volunteer healthy user effect

Question 5

measurments errors

Answer 5

is the difference between the measured value of a variable and its true population value

Question 6

random error

Answer 6

divergence of an observation of the sample from the true population due to chance
-lack of precision
sample size increases- precision increase decrease random error
sample size decreases- decrease precision increase random error

Question 7

internal validity

Answer 7

degree wich the results of a study are correct for the study of the population

Question 8

external validity

Answer 8

generalizability
can the results be apply to other populations
depend on internal validity