10 Using the table below, determine the INCREASING INTERVAL
U
f(x)
3
-2
-1
0
0
-5
-12
1
x>4
O
X
0
-13
-8
1
2
-5
-4
x>-3
3
4
5
-8
-13
6-
x<-3
x < 4

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.