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Biostatistics Exam 1/68 Questions with accurate Answers
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Biostatistics Exam 1/68 Questions with accurate Answers
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Biostatistics Exam 1/68 Questionswith accurate Answers
five important charteristics of data - - Center - a representative or average
value that indicates where the data set is located
Variation - a measure of the amount that the data values vary among
themselves
Distribution - the nature or shape of the distribution of the data (such as bell-
shaped, uniform, or skewed)
Outliers - sample values that lie very far away from the vast majority of the
other sample values
Time - changing characteristics of the data over time
- a representative or average value that indicates where the data set is
located - - Center
- a measure of the amount that the data values vary among themselves - -
Variation
- the nature or shape of the distribution of the data (such as bell-shaped,
uniform, or skewed) - - Distribution
- sample values that lie very far away from the vast majority of the other
sample values - - Outliers
- changing characteristics of the data over time - - Time
- in _______, the objective is to summarize or describe the important
characteristics of a set of data - - descriptive statistics
- in _______, sample data is used to make generalizations about a population
- - inferential statistics
- a ______ lists data values (either individually or by groups of intervals),
along with their corresponding frequencies (or counts) - - frequency
distribution
- the ____ for a particular class is the number of original values that fall into
that class. - - frequency
- the smallest numbers that can belong to the different classes - - lower
class limits
, - the largest numbers that can belong to the different classes - - upper class
limits
- numbers used to seperated classes, but without the gaps created by class
limits - - class boundaries
- how to find class midpoint - - add the lower class limit to the upper class
limit and divide the sum by 2
- the difference between two consecutive lower class limits or two
consecutive lower class boundaries - - class width
- how to construct a frequency distribution - - 1. select number of classes
(5-20)
2. class width = (max value - min value) / number of classes
3. choose lower limit
4. add class width to lower limit to make classes
5. tally values into classes
- relative frequencies are found by ___ - - dividing each class frequency by
the total of all frequencies.
- the _____ for a class is the sum of the frequencies for that class and all
previous classes - - cumulative frequency
- a ____ is a bar graph in which the horizontal scale represents classes of
data values and the vertical scale represents frequencies. The heights of the
bars correspond to the frequency values and the bars are drawn adjacent to
each other (without gaps) - - histogram
- has the same shape and horizontal scale as a histogram but the vertical
scale is marked with relative frequencies instead - - relative frequency
histogram
- uses line segments connected to points located directly above class
midpoint values. - - frequency polygon
- a line graph that depicts the cumulative frequencies - - ogive
- uses class boundaries, useful for determining the number of values below
some particular value - - ogive
- consists of a graph in which each data value is plotted as a point along a
scale of values. Dots representing equal values are stacked - - dotplot
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