How do i find the IQR for 50 terms?

Question

amistre64 · Answer

whats an IQR?

anonymous · Answer

Interquartile range

amistre64 · Answer

q0 q1 q2 q3 q4

are the quartiles right?  its been awhile

amistre64 · Answer

in anycase, the qs relate to the p0, p25, p50, p75, and p100

amistre64 · Answer

so you want the p25 thru te p75 percentiles

50 * .25 is the position of the p25

50 * .75 is the position of the p75

anonymous · Answer

yes they are the quartiles

amistre64 · Answer

if the position results in a whole number; you wanna average the position and the position + 1

amistre64 · Answer

does that make sense?

amistre64 · Answer

for example:

84 68 72 49 84 73

we would sort these in order from low to high

49  68  72  73  84  84

there are 6 data enteries;

p25 = 6 * .25 = 1.50; since this is not a whole number, round up to 2

p25 is the number in the 2nd position:  68

p75 = 6 * .75 = 4.50; since htis is not a whole number, round up to 5

p75 is the number in the 4th position:  84

the IQR is then the from the 2nd to the 5th positions

anonymous · Answer

yes it does! thanks for your help

amistre64 · Answer

youre welcome