BASIC STATISTICAL CONCEPTS

1
BASIC STATISTICAL CONCEPTS

• Chapter Four

2
CHAPTER OBJECTIVES
Understand (and in some cases be able to
calculate) the following

• Range
• Variance
• Standard Deviation
• Normal curve
• Skewed distribution
• Correlations

• Scales of Measurement
• Measures of central tendency (mean, median, mode)
• Frequency distribution

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SCALES OF MEASUREMENT

• In descriptive statistics, there are four
• scales of measurement that can be
• used to explain data
• NOMINAL
• ORDINAL
• INTERVAL
• RATIO

4
MEASURES OF CENTRAL TENDENCY

• MEAN
• MEDIAN
• MODE

5
Frequency Distribution

• Range
• Variance
• Standard Deviation

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Normal Distribution with Standard Deviations
Percent of the population
34
34
2
2
14
14
0
1SD
-1SD
-2SD
2SD
-3SD
3SD
Standard Deviation Units
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SKEWED DISTRIBUTIONSNegatively SkewedPositively
Skewed

• CORRELATIONS
• Positive Correlations
• Negative Correlations

8
CHAPTER OBJECTIVES
Understand (and in some cases be able to
calculate) the following

• Range
• Variance
• Standard Deviation
• Normal curve
• Skewed distribution
• Correlations

• Scales of Measurement
• Measures of central tendency (mean, median, mode)
• Frequency distribution

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THE END