online laboratory continuing education for clinical laboratories and med techs

# Descriptive Statistics (Online CE Course)

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This course discusses statistics that are used in the laboratory for assessment of quality control.

### Objectives

• Explain why knowledge of statistics is important to laboratory scientists.
• Define terms that are associated with descriptive statistics and apply them to specific situations.
• Prepare tables and figures of data that meet the criteria specified in this unit.
• Describe "frequency distribution" and explain the advantage of presenting data in this manner.
• Given a set of data, construct a frequency table according to criteria stated in this unit.
• Given a set of data, construct both actual and relative frequency distributions that accurately represent the discrete or continuous nature of the data.
• Given a set of data, calculate its variance and standard deviation.
• Given the mean and standard deviation of a set of data in a normal distribution, find the ranges encompassing 68%, 95%, and 99% of all observations.
• Describe at least two situations in which coefficient of variation is a useful tool.
• Calculate coefficient of variation when given the mean and standard deviation of a set of data.
• Explain how coefficient of variation is used in the clinical laboratory.

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### Course Outline

• Introduction to Statistics
• Introduction to Statistics
• Why Statistics?
• Descriptive Statistics
• Definition of Statistics Terms
• Samples and Populations
• Statistics and Parameters
• Independent and Dependent Variables
• Discrete and Continuous Data
• The focus of descriptive statistics is enumeration, organization, and graphic representation of data from an observed group or sample.
• Read the following passage, and identify the underlined words: The researchers tested 50 students chosen at random who had taken calculus in high scho...
• Read the following passage, and identify the underlined words: The researchers tested 50 students chosen at random who had taken calculus in high ...
• Read the following passage, and identify the underlined words: The researchers tested 50 students chosen at random who had taken calculus in high scho...
• Identify whether the underlined phrase is the independent of dependent variable: The amount of sunlight that plants receive is directly proportional t...
• Graphic Representation of Data
• Importance of Professional Tables and Graphs
• Table Specifications
• Figures Specification
• What is wrong with the following bar chart?Figure 3
• Frequency Distribution
• Data and Data Pairs
• Using Frequency Distributions
• Constructing Frequency Distributions
• A Frequency Distribution Example
• Step 1: Select Size and Number of Class Intervals
• Step 2: List the Class Intervals
• Step 3: Sort the Data
• Step 4: Determine Frequencies
• Step 5: Determine Relative Frequencies
• Graphing Frequency Distributions
• Bar Chart
• Histogram
• Frequency Polygon
• Absolute vs. Relative Frequency
• Use the following data for the next four questions: Table V Serum BUN values (mg/dL) from hospital employees at Kettering Medical Center ...
• Table V Serum BUN values (mg/dL) from hospital employees at Kettering Medical Center 15.922.59.116.86.428.615.223.710.317.013.820.57.425.04.118.412.71...
• Table V Serum BUN values (mg/dL) from hospital employees at Kettering Medical Center 15.922.59.116.86.428.615.223.710.317.013.820.57.425.04.118.412.71...
• Table V Serum BUN values (mg/dL) from hospital employees at Kettering Medical Center 15.9 22.5 ...
• Measures of Central Tendency
• Mean, Median, and Mode
• Mean
• Median
• Mode
• Use the following data for the next three questions: Table VINumber of children in household for 20 households in Atlanta, Georgia 4241121503102312161...
• Table VINumber of children in household for 20 households in Atlanta, Georgia 42411215031023121610What is the median number of children in a household...
• Table VINumber of children in household for 20 households in Atlanta, Georgia 42411215031023121610What is the mode of the number of children in a hous...
• Standard Deviation
• Standard Deviation (continued)
• Standard Deviation Example
• Standard Deviation Example (continued)
• Using the standard deviation formula,what is the standard deviation of the following data? You may find it helpful to duplicate this chart to perform ...
• Normal Distribution
• Introduction to the Normal Distribution
• Normal Distribution
• 68-95-99 Rule Illustrated
• Inferences from Sample Data
• Suppose you measured the plasma BUN levels in a sample of several healthy people. You found that the mean (average) was 19.6 mg/dL and the standard de...
• Your supervisor asks you to give the 95% range of normal plasma BUN levels, that is, the range within which 95% of healthy people will fall. What is t...
• Coefficient of Variation
• A Measure of Relative Variability
• Using the Coefficient of Variation
• Monitoring Methods
• What is the coefficient of variation (CV) of the data you used in the previous section? ( = 19.6 mg/dL, s = 6.1 mg/dL)

Level of instruction: Intermediate

Intended audience: This course is appropriate for laboratory professionals, and for students in clinical laboratory science programs who want a review of the statistics that are analyzed for assessment of quality control.

Author information: Beverly Schieltz, MS, MT(ASCP), is a lecturer in the Department of Biological Sciences at Wright State University located in Dayton, Ohio.

Brad Westover received his BS in Physics in 2006 from the California Institute of Technology. He is currently pursuing a Ph. D. at the University of California, San Diego.

Reviewer: Barbara Cebulski, MS, MLS(ASCP)CM  is a Program Director for MediaLab, Inc. She holds a Masters in Instructional Technology.

About the Course: This course is part of a series of courses adapted for the web by MediaLab Inc. under license from Educational Materials for Health Professionals Inc. Dayton OH, 45420. Copyright EMHP. It was reviewed and revised August 2012.

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