A group of young business woman wish to open high fashion boutiqe in avacant store but only if the average income of house hold in the area is atleast $25000 . a randum sample of 9 house hold show the following results :

$28000

$24000

$26000

$25000

$23000

$27000

$26000

$22000

$24000

Assume the population of income is normally distributed . What is the test statistic for level of significance

a) t -0.5

b) z-0.5

c) t-0

d) z-0

e) t=0.05

f) tg=0

g) tg/2=0.025

h) tg=0.05

i) tg= -1.86

j) t= -1.86