NUR 3405 QUIZ 4 QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026
What indexes do descriptive statistics contain? - Answers - variability of distribution
- frequency distributions
- central tendency
- standard deviation
A systematic arrangement of values from lowest to highest, together with a count or percentage
of how many times each value occurred is: - Answers - frequency distribution
Homogeneous data set - Answers - a narrow range or smaller variation
Negative correlation coefficient - Answers - relationship where one variable increases while the
other decreases
- between .00-1.00
- the higher the absolute value of a coefficient, the stronger the relationship (-.80 is stronger
than +.20)
The use of inferential statistics permits a researcher to: - Answers - draw conclusions about a
population based on information gathered from a sample
Statistical hypothesis testing - Answers - use of objective criteria for deciding whether research
hypotheses should be accepted as true or rejected as false
Type I Error - Answers - rejecting a true null hypothesis, false positive
Type II Error - Answers - failing to reject a false null hypothesis, false negative
How do researchers control the risk of making a type I error? - Answers - by selecting a level of
significance which is the probability that such an error will occur
significance level (alpha) - Answers - what we compare our p-value to, 0.05 is commonly used
P < 0.05 - Answers reject the null hypothesis
Chi-square test - Answers - used to test hypotheses about the proportion of cases in different
categories
T-Test - Answers - test the difference between the means of two groups
What important aspects of validity should an instrument or scale examine? - Answers - criterion
related validity
, - content validity
- construct validity
Common threats to internal validity - Answers - selection
- mortality
- maturation
- history
External validity is important to EBP because it allows researchers to - Answers - generalize
evidence from controlled settings to real-world practice settings
What does internal validity measure? - Answers - the research results for accuracy
What are common threats to external validity? - Answers - experimenter
- reactivity
- novelty (knowledge of what is being done effects outcome)
What aspects of reliability are important to quantitative researchers? - Answers - internal
consistency
- equivalence
- stability
What is the stability of an instrument? - Answers - the degree to which similar results are
obtained on separate occasions
Reliability coefficient - Answers - an index of reliability
- .00 to 1.00
- the higher the value, the more reliable is the instrument
How is internal consistency evaluated? - Answers - by calculating the coefficient alpha
(Cronbach's alpha)
Interrater reliability - Answers - the degree to which two or more observers or coders agree
about the scoring in an instrument
Nominal measurement - Answers - lowest level
- involves using numbers simply to categorize attributes
Ordinal measurement - Answers - ranks people on attribute
What indexes do descriptive statistics contain? - Answers - variability of distribution
- frequency distributions
- central tendency
- standard deviation
A systematic arrangement of values from lowest to highest, together with a count or percentage
of how many times each value occurred is: - Answers - frequency distribution
Homogeneous data set - Answers - a narrow range or smaller variation
Negative correlation coefficient - Answers - relationship where one variable increases while the
other decreases
- between .00-1.00
- the higher the absolute value of a coefficient, the stronger the relationship (-.80 is stronger
than +.20)
The use of inferential statistics permits a researcher to: - Answers - draw conclusions about a
population based on information gathered from a sample
Statistical hypothesis testing - Answers - use of objective criteria for deciding whether research
hypotheses should be accepted as true or rejected as false
Type I Error - Answers - rejecting a true null hypothesis, false positive
Type II Error - Answers - failing to reject a false null hypothesis, false negative
How do researchers control the risk of making a type I error? - Answers - by selecting a level of
significance which is the probability that such an error will occur
significance level (alpha) - Answers - what we compare our p-value to, 0.05 is commonly used
P < 0.05 - Answers reject the null hypothesis
Chi-square test - Answers - used to test hypotheses about the proportion of cases in different
categories
T-Test - Answers - test the difference between the means of two groups
What important aspects of validity should an instrument or scale examine? - Answers - criterion
related validity
, - content validity
- construct validity
Common threats to internal validity - Answers - selection
- mortality
- maturation
- history
External validity is important to EBP because it allows researchers to - Answers - generalize
evidence from controlled settings to real-world practice settings
What does internal validity measure? - Answers - the research results for accuracy
What are common threats to external validity? - Answers - experimenter
- reactivity
- novelty (knowledge of what is being done effects outcome)
What aspects of reliability are important to quantitative researchers? - Answers - internal
consistency
- equivalence
- stability
What is the stability of an instrument? - Answers - the degree to which similar results are
obtained on separate occasions
Reliability coefficient - Answers - an index of reliability
- .00 to 1.00
- the higher the value, the more reliable is the instrument
How is internal consistency evaluated? - Answers - by calculating the coefficient alpha
(Cronbach's alpha)
Interrater reliability - Answers - the degree to which two or more observers or coders agree
about the scoring in an instrument
Nominal measurement - Answers - lowest level
- involves using numbers simply to categorize attributes
Ordinal measurement - Answers - ranks people on attribute
