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# AU - DMS 2510 - Class Notes - Week 1

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Schools > Auburn University > Math > DMS 2510 > AU - DMS 2510 - Class Notes - Week 1

AU - DMS 2510 - Class Notes - Week 1

This preview shows pages 1 - 2 of a 6 page document. to view the rest of the content Statistics in Health and Biology  8/22/16 1:46 PM   Chapter 1

Section 1.1
Descriptive statistics: Consists of methods for organizing and summarizing information; it
includes the construction of graphs, charts, and tables, and the calculation of various descriptive
measures such as averages, measures of variation, and percentiles.
Population: The collection of all individuals or items under consideration in a statistical study.
Sample: The part of the population from which information is obtained.
Parameter: Numerical values describing a population.
Statistics: Numerical values describing a sample.
Inferential Statistics: Consists of methods for drawing and measuring the reliability of
conclusions about a population based on information obtained from a sample of the population. Statistics in Health and Biology  8/22/16 1:46 PM   Chapter 2:

Section 2.1
Variable: A characteristic that varies from one person or thing to another
Qualitative Variable: A nonnumerically valued variable
Quantitative Variable: A numerically valued variable
Discrete Variable: A quantitative variable whose possible values can be listed.  In particular, a
quantitative variable with only a finite number of possible values is a discrete variable.
Continuous variable: A quantitative variable whose possible values from some interval of
numbers.
Data: Values of variables
Qualitative Data: Values of qualitative variable
Quantitative Data: Values of quantitative variable.
Discrete Data: Values of discrete variable
Continuous Data: Values of continuous variable.

Section 2.2:
Frequency distribution of qualitative data: A listing of the distinct values and their frequencies.
•  List the distinct values of the observations in the data set in the first column of a table  •  For each observation place a tally mark in the second column of the table in the row  of the appropriate distinct value  •  Count the tallies for each distinct value and record the totals in the third column of the  table.  Relative-frequency distribution of qualitative data: is a listing of distinct values and their relative
frequencies.
•  Obtain a frequency distribution of data divide each frequency by the total number of  observations  Pie Chart: A disk divided into wedge-shaped pieces proportional to relative frequencies of
qualitative data.
•  Obtain a relative-frequency distribution of the data  •  Divide a disk into wedge-shaped pieces proportional to the relative frequencies  •  Label the slices with distinct values and their relative frequencies  Bar Chart: Displays the distinct values of the qualitative data on a horizontal axis and the relative
frequencies (or frequencies or percent) of those values on a vertical axis. The relative frequency
of each distinct value is represented by a vertical bar whose height is equal to the relative
frequency of that value. The bars should be positioned so that they do not touch each other.

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