Mipango

Kikokotoo cha Mkengeuko Sanifu

Weka namba zako na uchague idadi ya watu wote au sampuli.

Angalau thamani mbili, zikitenganishwa kwa koma au nafasi

Tokeo

Weka thamani kisha bonyeza Kokotoa ili kuona tokeo.

Fomula

σ=∑(xi−μ)2n\sigma = \sqrt{\frac{\sum (x_i - \mu)^2}{n}}

Population standard deviation.

s=∑(xi−xˉ)2n−1s = \sqrt{\frac{\sum (x_i - \bar{x})^2}{n - 1}}

Sample standard deviation uses n − 1 (Bessel’s correction).

Jinsi ya kutumia kikokotoo hiki

  1. Enter the data and choose population if it is the whole group, or sample if it is part of a larger group.
  2. Press Calculate.

Mfano uliotatuliwa

Population: 2, 4, 4, 4, 5, 5, 7, 9

The mean is 5 and the squared deviations add up to 32.

Variance = 32 / 8 = 4, so the standard deviation is √4 = 2.

Maswali yanayoulizwa mara kwa mara

Population or sample?

Use population when you have every member of the group; use sample when your data is a subset used to estimate the whole.

What does standard deviation tell me?

How far values typically are from the mean. Larger means more spread out.

Jifunze zaidi