Statistics Exam 1

# Statistics Exam 1 - Statistics Exam 1 A Summation Add Start...

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Statistics: Exam 1 A) Summation - = Add - Start with i value, stop with top #, fill in as x and add up 28 ) ( 4 ) ( 1 = = stop start i x = = 4 3 18 i x Constant (c) = 2 48 10 16 12 ) 10 2 ( ) 8 2 ( ) 6 2 ( 4 2 = + + = + + = = i cx = = 3 1 2 i y cx 756 7 36 3 7 6 3 192 4 16 3 4 4 3 12 1 4 3 1 2 3 2 2 2 = = = = = = = 12+192+756 = 960 c=3 x 4 6 8 10 6 x y 2 1 4 4 6 7 8 8 11 9

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B) Constructing Frequency Distribution Tables 1) # of class intervals : given EX: 6 CI 2) Determine size of CI : (round if decimal) Highest value – lowest value # of class intervals EX: 95-29 = 11 size=11 6 3) Determine lowest CI : a) must contain lowest score b) lowest score in LCI must be evenly divisible by the size of CI EX: 22-32 4) Find other intervals : add by size, remember to include # when counting EX: 22-32, 33-43, 44-54, 55-65, 66-76, 77-87, 88-98 5) Make table, find : a) Frequency (f): count how many numbers fall in each interval
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## This note was uploaded on 04/27/2008 for the course PSY 225 taught by Professor Johnson during the Spring '08 term at University of North Carolina Wilmington.

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Statistics Exam 1 - Statistics Exam 1 A Summation Add Start...

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