Eco 221 Notes Exam 1 copy

Eco 221 Notes Exam 1 copy - Eco 221 Notes Exam 1 Set up a...

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Eco 221 Notes Exam 1 Set up a Freq. Dist Table: (pg.58 book) 1. Class Width CW=(highest value) –(Lowest value) / (#of classes desired) ((26.3) - (-6.1)) / 8 = 4.05 . . round to 5.0, best to have units in 5’s,or 10’s, 2. Frequency Distribution How many people? Put # of pop. into classes. *Note in classes if your upper boundary includes or excludes. (excludes would be “up to”) Total will equal whole pop size. 3. Relative Frequency Distribution (RFD) What percent? (Freq) / (pop size); ie 20 people in class 1. pop size 200. 20/200= 0.10. Total will always = 1.00 4. Cumulative Frequency Distribution (CFD) How many people spent less than? Add the Freq. Dist. 1 st class is same, 20 in Freq is 20 in CFD. 2 nd column is 1 st nd Freq. & continue adding up. 5. Cumulative Relative Frequency Distribution (CRFD) What percent spent less than ? Add up either the RFD ie(0.10 + 0.15= 0.25 CRF column) or If have CFD column; take the number from each corresponding row & divide by pop size. ie. ( CFD = 50, 50 / 200 = 0.25 CRF ) 6. Midpoint (M) Ave of boundaries…need to have closed boundaries ((lower boundary) + (upper boundary)) / 2 1
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Graphs- Histogram 7. Histogram : if asks for bar chart see pg 2 of 9/11 notebook CLASS QUIZ RESULTS: 86, 85, 73, 97, 77, 92, 63, 84, 51, 78, 81, 79, 96, 75, 72, 85, 81, 73, 76, 83, 67, 93 4 students got “A’s” (averages 90 – 100) –this would be class intervals 7 students got “B’s” (averages 80 -89) 8 students got “C’s” (averages 70-79)
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This note was uploaded on 04/18/2008 for the course ECO 221 taught by Professor Mostaghimi during the Fall '08 term at S. Connecticut.

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Eco 221 Notes Exam 1 copy - Eco 221 Notes Exam 1 Set up a...

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