NURS 5366 week 5 Nursing Research
Statistics. Exam Questions With 100%
Verified Answers.
Chapter 3 - answer✔DESCRIPTIVE STATISTICS, PROBABILITY, AND MEASURE OF
CENTRAL TENDENCY
descriptive Statistics - answer✔computed to reveal characteristics of the sample and to describe
study variable
How to describe a sample - answer✔create a frequency distribution of the variable or variable
being studied
- is a plot of one variable, whereby the x-axis consists of possible values of that variable , and the
y - axis is tally of each value
Inferential Statistics - answer✔computed to draw conclusions and make inferences about the
greater population, based on the sample data set.
Bi Modal - answer✔having or providing two modes, ,methods, systems, etc.
-having 2 values/categories that have highest occurrence and are equal frequencies
Central Tendency - answer✔indicator of center of data
-nominal variable= categorical differences EX: gender (tendency of samples of given
measurement to cluster around some central value.
Measures of Central tendency are descriptive statistics.
Statistics represent measures of central tendency are mean, median and mode (all are
representations or descriptions of the center or middle of a frequency distribution
mean= arithmetic average of all of the values of a variable.
median= exact middle value ( or average of the middle two values if there is an even number of
observations)
mode= most commonly occurring value in a data set. can have more than one mode in a sample.
in a normal curve, mean, median and mode are equal or approximately equal
Multimodal - answer✔having more than 2 modes
Unimodal - answer✔When distribution only has one mode
-the frequencies progressively decline as they move away from the mode. Symmetrical
distributions are usually uni modal.
bimodal - answer✔means you have not defined your population if you find a bimodal
Mode - answer✔most frequently occurring measure (value or category) in (distribution) data
Mean - answer✔called location parameter
most frequent central tendency but requires interval and ratio data
-sum of values divided by total # of observations
Median - answer✔for ordinal, interval and ratio data, value in middle when you line up all
measured values in order from least to most, 50th percentile value.
-data that is rank ordered (ordinal, interval and ratio)
has second measure of central tendencies :median
Range - answer✔difference between maximum value and minimum value of variable in
distribution
probability - answer✔chance that particular outcome will occur after an event
**long-run relative frequency EX: dice/100 rolls
Standard Deviation - answer✔average distance of values from variable mean. Large SD =
spreading among variable in data set is large.
FORMULA :
-1st find mean (average) then place in formula then square root (check mark with x)
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