Statistical Report on Numeralica

Histogram of scores

                                           x  

                               x           x  

                               x           x  

 x              x           x  x  x  x  x  x  x

 x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x

11 13 15 16 21 24 25 26 27 28 29 30 31 32 33 34 35

Histogram of ages

                               x

                               x

    x  x  x           x  x     x  x        x              x

 x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x  x 

17 21 23 25 27 29 30 31 32 35 38 41 42 43 44 46 48 59 64 69

Sex distribution

Country distribution

Date when taken

Sample information

N = 31

Lowest raw score = 11

Highest raw score = 35

Range = 25

Resolution = 4.5

Central tendency and dispersion

Mean = 27.06

Median = 29

Mode = 33

Raw score standard deviation = 6.94

Quartile deviation = 4

Standard error of measurement = 1.81 raw score points

Distribution shape

Skewness = -1.2

Excess Kurtosis = 0.41

Test difficulty

Sample-dependent Hardness = 0.17

Sample-independent Hardness = 0.23

Items solved by all = 3

Items solved by none = 0

Reliability

Cronbach's alpha = 0.9317

Split Half Reliability Index = 0.8827

Spearman–Brown corrected = 0.9377

McDonald's omega = 0.9355

Test dimensionality = unidimensional

Overall discrimination = 0.5369

You can find explanations about the discrimination computation here.