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1.3 - Frequency Distributions (Solutions)

# 1.3 - Frequency Distributions (Solutions) - 1.2 Frequency...

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1.2 – Frequency Distributions 1 Section 1.2 Frequency Distributions GOAL: to organize raw data into a more meaningful form CLASS TALLY FREQUENCY REL. FREQ. CUMUL. FREQ. RAW DATA: collected data that has not been organized **Column headings vary depending on desired statistical analysis** FREQUENCY DISTRIBUTIONS

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1.2 – Frequency Distributions 2 Range = Maximum Value Minimum Value RULE #1: Each observation must fit into only ONE class RULE #2: ALL observations MUST be included CLASS Step 1: Class Width n Range Width Use EQUAL class widths and CONVENIENT numbers Step 2: Class Limits Use CONVENIENT class limits n = Number of Observations TALLY Make a “tick” for every observations that falls into the appropriate class Count the number of “ticks” in tally for each class FREQUENCY
1.2 – Frequency Distributions 3 RELATIVE FREQUENCY n Frequency Class Frequency Relative The fraction of total observations in each class Usually expressed as a PERCENT CUMULATIVE FREQUENCY A running total of the RELATIVE FREQUENCIES

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1.3 - Frequency Distributions (Solutions) - 1.2 Frequency...

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