plz explain 3rd bullet
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Model uncertainty means suppose you take the 15 sample assuming simple linear regression( y = bô + b1^ + e) then the simple regression line is blue line but suppose you take rhe 35 sample data then your regression line is red line which means it is subject to model uncertainty
Parameter uncertainty means your individual slope coefficient are insignificant i.e. null hypothesis come in fail to reject reason but you consider it as significant and use in your model so that is parameter uncertainty