2007-11-29 01:37:43 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
To find the interquartile range you need to find the upper and lower quartiles. To do this find the median of your data set. Next take the numbers above the median, and find the median of those numbers, that is your upper quartile. Take the numbers below the median and find the median of those numbers, that is your lower quartile. Subtract the lower quartile from the upper quartile, and that is your interquartile range. Sorry, I can't help you with standard deviation :(
2007-11-29 01:49:10 · answer #1 · answered by peachmonk 4 · 3⤊ 0⤋
Calculate the 1st Quartile and the 3rd Quartile.Next, the Inter quartile Range is= Q3minus Q1.....that's it.
Standard deviation:
Steps are:
1)take one arbitrary mean (assumed mean that is.....call it "A")
2)calculate the deviations of every size/observation (call this as "d"
3)if there are frequencies(f) in the series, multiply every "d" with corresponding "f",ie., frequency;
you get "fd" against each size
4)multiply the "fd' by "d".....each 'fd' by corresponding "d";
you get "fd square(s)"
5)add all "fd(s) ....which is "summation of fd(s).
6)add all the "fd squares"......which is summation of "fd squares"
7)use the following formula:
s.d.= square root of [ sum of {fd squares divided by N ..(ie.; total of "f"(frequencies)} minus {(sum of fd) divided by N].
This is the easiest method and known as "short cut method"
for calculating standard deviation.
2007-11-29 10:08:52 · answer #2 · answered by bikashroy9 7 · 1⤊ 0⤋
To find the interquartile range you need to find the upper and lower quartiles. To do this find the median of your data set. Next take the numbers above the median, and find the median of those numbers, that is your upper quartile. Take the numbers below the median and find the median of those numbers, that is your lower quartile. Subtract the lower quartile from the upper quartile, and that is your interquartile range. Sorry, I can't help you with standard deviation :(
2007-11-29 09:54:22 · answer #3 · answered by Jairus N 1 · 2⤊ 7⤋
0.66,2.47,4.11,5.39,1.15,2.75,4.59,5.53,1.47,3.01,4.72,5.67,1.74,3.36,4.86,6.05,2.14,3.74.,5.09,6.53
2013-10-30 18:58:24 · answer #4 · answered by haifa z 2 · 0⤊ 0⤋