Conic forms have both a standard and a general equation form.

1)a standard, no general equation
2)no standard form, no general equation
3)no standard form, no general equation
4)a standard, a general equation

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.