(a)  

Deleted Obs. (i)	${\mathit{\Delta }}_i{\widehat{\mathit{\beta }}}_1$	% change parameter of the std. error	Deleted Obs. (i)	${\mathit{\Delta }}_i{\widehat{\mathit{\beta }}}_{\mathit{2}}$	% change parameter of the std. error
730	0.0023234	30.57	413	−0.0439987	18.94
162	−0.0021205	27.90	585	−0.0428435	18.44
262	−0.0020957	27.58	343	−0.0427599	18.41
421	−0.0017624	23.20	368	−0.0423473	18.23
542	0.0017002	22.37	544	−0.04214	18.14
580	0.001611	21.20	447	−0.041601	17.91
Sd. error (${\widehat{\mathit{\beta }}}_{\mathit{1}}$) of full model = 0.00760			Sd. error (${\widehat{\mathit{\beta }}}_{\mathit{2}}$) of full model = 0.23231