anyone know what a quartile class is? to find q1 i need to use the lower boundary of the first quartile class, but i don't even know what that is.
Stacey Warren - Expert brainly.com
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The values that divide the data set into 4 equal parts after it has been arranged in ascending orden are called quartiles.
Q1 , the lowest quartile is known as the lower quartile, or first quartile. The lowest 25% of the data being found below the first quartile value. It is the same as P25.
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sorry, i still don't get it. so for example if my chart consists of:
what's my Q1?
This falls in 25% category
i hate statistics! ┻━┻ ︵ヽ(`Д´)ﾉ︵ ┻━┻
(i wrote this for archive so i can check it again) ahh i finally know what it is
group freq cumulative freq
1-10 6 6
11–20 6 12
21-30 9 21
31-40 21 42
41-50 20 62 Q1
51-60 16 78
61-70 25 103
71-80 17 120
81-90 26 146 Q3
91-100 45 191
so multiply 1/4 with n (total frequency) [if it's odd: total freq + 1]
1/4*191+1 = 48
somewhere up in the data the 48th data is in there
it's group 41-50
and Q3 is in group 81-90 because the 144th data is in there
i feel so happy rn