Exam (elaborations)
BCPS Statistics – Questions & Solutions
BCPS Statistics – Questions & Solutions
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BCPS Statistics – Questions & SolutionsNOIR Correct Ans - Data types: nominal, ordinal, interval, ratio
Nominal Correct Ans - Yes or No variables or sex, mortality, dz
presence, race, marital status
Ordinal Correct Ans - Ranked in order but no magnitude of ranks.
Ex: NYHA, scale
*means and SD should not be reported
Interval Correct Ans - Data ranked in order. Zero is arbitrary. Points
can pass zero. Ex: Fahrenheit temperature
Ratio Correct Ans - Measurables and continuous. The values don't
cross zero. Ex: HR, BP, time, distance
Visual methods of describing data (3) Correct Ans - Frequency
distribution, histogram, scatterplot
Measures of central tendency Correct Ans - Mean, median, mode
Mean Correct Ans - Generally used for continuous and normally
distributed data
Median Correct Ans - Midpoint of values when placed in order from
highest to lowest
*ordinal or continuous data
Mode Correct Ans - Most common value
* used for nominal, ordinal or continuous
*does not help describe meaningful distributions with a large range of
values each occurring infrequent
2 types of discrete variables Correct Ans - Nominal and ordinal
Nominal data Correct Ans - Unordered data. Ex-sex, mortality,
disease presence, race, marital status
, Ordinal data Correct Ans - Ranked in "order" but no consistent
level of magnitude of difference between ranks. 1 and 2 in the hf scale
doesn't match up as the regular number 1 and 2. The interval between the
numbers doesn't mean the same thing.
Common error with ordinal data Correct Ans - Means and SD
should not be reported
Interval scale Correct Ans - Data ranked in a specific order with a
chance consistent change in magnitude between units. The zero point is
arbitrary. Ex-degrees Fahrenheit. You can have a negative temperature
Ratio scale Correct Ans - Interval but with an absolute zero
-degrees kelvin
-age
-hr
-BP
-time
-distance
Visual methods of describing data (3) Correct Ans - -frequency
distribution
-histogram
-scatterplot
Numerical methods of describing data (3) Correct Ans - -mean
-median
-mode
Mean used for what type of data? Correct Ans - -continuous and
-normally distributed
Median AKA Correct Ans - 50th percentile
Median used for what type of data? Correct Ans - -ordinal or
-continuous
-especially good for skewed populations
-insensitive to outliers
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