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A heterogeneous sample may negatively affect a study’s internal validity but may enhance its external validity. 

 

The threat of mortality can arise if there is differential attrition from groups. 

 

Intervention fidelity is a particularly important concept in correlational research. 

 

One way to weaken the statistical conclusion validity of a study is to use too large a sample. 

 

A randomization is a tool used to combat bias in qualitative studies. 

 

Study context (situational) factors are typically controlled by efforts to achieve constancy of conditions. 

 

Random assignment eliminates selection bias. 

 

Internal validity refers to the ability of results to be generalized to other populations.

 

A laboratory research study usually exhibits a high degree of internal validity.

 

A homogeneous population of subjects in a study could decrease external validity. 

 

Mortality is a threat to the internal validity of a study because those who dropped out of the study may be different from those who remained in the study. 

 

 

SCIENCE
HEALTH SCIENCE
NURSING
NURS 435

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