The high temperature today was 62º. When the
night time comes, the
temperature will drop
40°. By 4 A. M., the
temperature will drop an
additional 40°. What is
the temperature at 4
A. M.2

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.