Summarize and Compare Responses

Summarize and Compare Responses

Mean (Average) Median Standard Deviation

Mean (Average) Median Standard Deviation

16, 23, 25, 17, 26, 24, 11, 24, 19, 21, 15, 13, 21, 21, 20, 20, 21, 28, 18, 17, 17, 22, 20, 10, 22, 23, 16, 22, 20, 21, 21, 21, 31, 17, 21, 16, 16, 20, 18, 22, 18, 22, 22, 16, 21, 17, 25, 20, 21, 26

Hypothetical: David Archuleta releases a CDHypothetical: David Archuleta releases a CD

50 CD buyers, chosen at random. Asked their age.

50 CD buyers, chosen at random. Asked their age.

16, 23, 25, 17, 26, 24, 11, 24, 19, 21, 15, 13, 21, 21, 20, 20, 21, 28, 18, 17, 17, 22, 20, 10, 22, 23, 16, 22, 20, 21, 21, 21, 31, 17, 21, 16, 16, 20, 18, 22, 18, 22, 22, 16, 21, 17, 25, 20, 21, 26

Hypothetical: David Archuleta releases a CDHypothetical: David Archuleta releases a CD

50 CD buyers, chosen at random. Asked their age.

50 CD buyers, chosen at random. Asked their age.

Mean = 20.1 yearsMedian = 21.0 yearsStandard Deviation = 4.1 years

Frequency Table

Age (years) # of Sales10 111 112 013 114 015 116 517 518 319 120 621 1022 623 224 225 226 227 028 129 030 031 1

Frequency Histogram

50 responses

1000 responses

2000 responses

3000 responses

4000 responses

5000 responses

6000 responses

Bell Shaped Pattern

Gaussian (Normal) Distribution

Peaked & Symmetric

2 Inflection Points

“Spread” in ResponsesStandard Deviation

68.3% of Total Area

CD Sales in Missouri

Different Mean & Std. Dev.

Still 68.3% of Total Area

Skewed Distribution

Skewed Distribution

Utah Sales

Missouri Sales