week5_lect_A_posted

week5_lect_A_posted - WEEK 5 MONDAY SAMPLE STATISTICS 1...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
1 WEEK 5 MONDAY SAMPLE STATISTICS
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 PERCENTILES Division of ordered data into: halves: median quarters: quartiles 100ths : percentiles Quartiles middle observation above the median and below the median Q1 = 25 th percentile Q2 = 50 th percentile = median Q3 = 75 th percentile
Background image of page 2
3 Ex. 1 - Quartiles 1. Data: 7, 23, 75, 82, 34, 91, 10 2. Put it in order: 7, 10, 23, 34, 75, 82, 91 1. Find the median: 34 2. Below the median: 7, 10, 23 Lower Quartile Q1 = 10 3. Above the median: 75, 82, 91 Upper Quartile Q3 = 82
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 7, 8, 22, 38, 48, 62 Median = (22+38)/2 = 30 7, 8, 22, 38, 48, 62 Q1 =8 Q3 = 48 7, 8, 22, 38, 48, 62 Ex. 2 - Quartiles
Background image of page 4
5 125, 126, 127, 129, 133, 136, 136, 140, 141, 143, 143, 147, 152 125, 126, 127, 129, 133, 136, 136 , 140, 141, 143, 143, 147, 152 Q1 = (127+129)/2 = 128 Q3 = (143 + 143)/2 = 143 Ex. 3 - Quartiles
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 5 Number Summary (minimum, Q1, median, Q3, maximum) = (125, 128, 136, 143, 152)
Background image of page 6
7 1) Range = Max – Min - easy to compute but only uses two data values Measures of Spread 2) Interquartile Range = Q3 - Q1 ( IQR ) 3) Standard Deviation
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Box Plot Visual display of 5 number summary: ( MINIMUM, Q1, Q2, Q3, MAXIMUM ) Q 1 Q 2 = median Q 3 Min Max 30 42 45 17 55 42 45 30 17 55 Range = Max – Min = 55 – 17 = 38 IQR = Q3 – Q1 = 45 – 30 = 15
Background image of page 8
9 MEASURES OF SPREAD (continued) (3) Standard Deviation
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 26

week5_lect_A_posted - WEEK 5 MONDAY SAMPLE STATISTICS 1...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online