Describe the difference between the expected and observed data? Study Body Mass

Question

Describe the difference between the expected and observed data?

Study Body Mass Index vs Arthritis

TOLD HAVE ARTHRITIS COMPUTED BODY MASS INDEX CATEGORIES Crosstabulation COMPUTED BODY MASS INDEX CATEGORIES Norma Weight Underweight OverweightObese Total Count Expected Count % within TOLD HAVE ARTHRITIS 96 within COMPUTED BODY MASS INDEX CATEGORIES % of Total Std. Residual Count Expected Count % within TOLD HAVE ARTHRITIS 96 within COMPUTED BODY MASS INDEX CATEGORIES % of Total Std. Residual 390b 482.3 26.3% 1483 34.0 1483.0 36.3% | 100.0% TOLD HAVE ARTHRITIS YES 537a 545.3 36.2% 539c 27.9% 28.3% 34.5% 43.5%| 35.0% 12.7% 12.7%| 35.0% 1011 a 1004.6 37.0% NO 43a, b 981 b 888.5 35.9% 697c 2732 799.5 2732.0 25.5% | 1 00.0% 70.5% 71.2% 64.9% 56.2% | 64.5% 23.2% 23.9% 16.5%| 64.5% Dont Know Count Expected Count % within TOLD HAVE ARTHRITIS 96 within COMPUTED BODY MASS INDEX CATEGORIES % of Total Std. Residual Count Expected Count % within TOLD HAVE ARTHRITIS 96 within COMPUTED BODY MASS INDEX CATEGORIES % of Total 22.0 100.0% 31.8% 45.5% | n

Explanation / Answer

Observed data : resulting from performing the experiment and recording (observing) the individual values of the variable under study.

Expected data : the weighted average of all the possible values of that variable, with the corresponding probabilities used as weights.

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