Stats

Question 1

What are the Outlier calculation’s

Answer 1

lower outlier = Q1 - (1.5 * IQR)
higher outlier = Q3 + (1.5 * IQR)
lower outlier = mean - 2(Sx)
upper outlier = mean + 2(Sx)

Question 2

variance formula

Answer 2

variance——> S^2 = Sxx/n-1

Question 3

Sxx (sum of squares of the variable x.)

Answer 3

sum of x^2 - n*mean^2

Question 4

Histogram mean calculation

Answer 4

mid class value * frequency = f Md.
Sum of (f Md.) / Sum of (frequency) = mean

Question 5

Median of histogram workings

Answer 5

(Median X - class border of corresponding frequency )/(class width) =
(median of frequency - median frequency border/frequency class width) so then you rearrange for X

Question 6

Ranked data median

Answer 6

(n + 1)/2

Question 7

on ranked data if two rows have the same number, what do you do

Answer 7

then you give both the same rank but with an extra 0.5 to share the value of the next rank I think

Question 8

mean calculation

Answer 8

sum of X/n

Question 9

frequency density

Answer 9

frequency/class width = frequency density

Question 10

what should be on the y axis

Answer 10

frequency density