illustrated Questions And Answers 2025
control - Answer - The measures used to hold uniform or constant
the conditions in a research study
confidence interval - Answer - An estimated range of values, which are likely to include an unknown
population parameter calculated from a given set of sample data. Abbreviated CI.
alpha - Answer - Considered an a priori probability because it is
set before the data are collected. Also considered a conditional probability because the null hypothesis is
assumed to be true
clinical question - Answer - A presentation of an idea that forms the foundation for a study; it is
developed from the research problem and results in the research hypothesis.
alpha coefficient - Answer - A number between 0 and 1 that expresses the relationship between the
error variance, true variance, and the observed score. A correlation
of 0 indicates no relationship; the closer to 1 the
coefficient is, the more reliable is the tool
accessible population - Answer - A population that meets the population criteria and is available
bias - Answer - A distortion in the interpretation of the results of
the data analysis.
Dependant variable - Answer - In experimental studies, the presumed effect of the independent or
experimental variable on the outcome. Variation in the independent variable changes this effect. The
dependent variable is observed but not manipulated.
,cluster sampling - Answer - A probability sampling strategy that involves successive random sampling of
units. The units sampled progress from large to small. Also known as multistage sampling
alternate form reliability - Answer - A reliability measure in which two or more alternate forms of a
measure are administered to the same participants at different times. The scores of the two tests
determine the degree of relationship between the measures. Also called parallel-form reliability.
findings - Answer - The statistical results of a study and the conclusions, interpretations,
recommendations, generalizations, and implications for future research and nursing practice
Analysis of Covariance (ANCOVA) - Answer - A statistic that measures differences among group means
and uses a statistical technique to equate the groups under study in relation to an important variable.
objectivity - Answer - The use of facts without distortion by
personal feelings or bias
Directional hypothesis - Answer - A hypothesis that specifies the expected direction of the relationship
between independent and dependent variables
convenience sampling - Answer - A non-probability sampling strategy in which the most readily
accessible persons or objects serve as participants or participants of a study.
Auditability - Answer - The characteristic of a qualitative study, developed by the investigator's research
process, that allows another researcher or a reader to follow the thinking or conclusions of the
investigator.
Generalizability - Answer - The extent to which data can be inferred to be representative of similar
phenomena in a population beyond the studied sample
Analysis of Variance (ANOVA) - Answer - A statistic that tests whether group means differ from each
other; instead of testing each pair of means separately, ANOVA considers the variation among all groups.
, limitations - Answer - The weaknesses of a study
Chi-square - Answer - A nonparametric statistic used to determine whether the frequency found in each
category is different from the frequency that would be expected by chance.
accuracy - Answer - The characteristic of all aspects of a study
systematically and logically following from the
research problem.
chance error - Answer - An error attributable to fluctuations in subject characteristics that occur at a
specific point in time and are often beyond the awareness and control of the examiner; an error that is
difficult to control,
unsystematic, and unpredictable and thus cannot be corrected. Also called random error
data saturation - Answer - A point when the information collected by the researcher becomes repetitive;
ideas conveyed by the participant have been shared previously by other participants, and inclusion of
additional participants does not result in new ideas.
hypothesis - Answer - A best guess or prediction about what a
researcher expects to find with regard to the
relationship between two or more variables.
pilot study - Answer - A small, simple study conducted as a
prelude to a larger-scale study (which is often called
the "parent study").
independent variable - Answer - The antecedent or variable that has the presumed effect on the
dependent variable. The independent variable is manipulated in experimental research studies
delimitations - Answer - Characteristics that restrict the population to a homogeneous group of
participants.